Now showing 1 - 9 of 9
  • 2017Journal Article
    [["dc.bibliographiccitation.firstpage","6742763"],["dc.bibliographiccitation.journal","Computational and mathematical methods in medicine"],["dc.bibliographiccitation.lastpage","17"],["dc.bibliographiccitation.volume","2017"],["dc.contributor.author","Friedrichs, Stefanie"],["dc.contributor.author","Manitz, Juliane"],["dc.contributor.author","Burger, Patricia"],["dc.contributor.author","Amos, Christopher I."],["dc.contributor.author","Risch, Angela"],["dc.contributor.author","Chang-Claude, Jenny"],["dc.contributor.author","Wichmann, Heinz-Erich"],["dc.contributor.author","Kneib, Thomas"],["dc.contributor.author","Bickeböller, Heike"],["dc.contributor.author","Hofner, Benjamin"],["dc.date.accessioned","2018-03-13T14:55:43Z"],["dc.date.available","2018-03-13T14:55:43Z"],["dc.date.issued","2017"],["dc.description.abstract","The analysis of genome-wide association studies (GWAS) benefits from the investigation of biologically meaningful gene sets, such as gene-interaction networks (pathways). We propose an extension to a successful kernel-based pathway analysis approach by integrating kernel functions into a powerful algorithmic framework for variable selection, to enable investigation of multiple pathways simultaneously. We employ genetic similarity kernels from the logistic kernel machine test (LKMT) as base-learners in a boosting algorithm. A model to explain case-control status is created iteratively by selecting pathways that improve its prediction ability. We evaluated our method in simulation studies adopting 50 pathways for different sample sizes and genetic effect strengths. Additionally, we included an exemplary application of kernel boosting to a rheumatoid arthritis and a lung cancer dataset. Simulations indicate that kernel boosting outperforms the LKMT in certain genetic scenarios. Applications to GWAS data on rheumatoid arthritis and lung cancer resulted in sparse models which were based on pathways interpretable in a clinical sense. Kernel boosting is highly flexible in terms of considered variables and overcomes the problem of multiple testing. Additionally, it enables the prediction of clinical outcomes. Thus, kernel boosting constitutes a new, powerful tool in the analysis of GWAS data and towards the understanding of biological processes involved in disease susceptibility."],["dc.identifier.doi","10.1155/2017/6742763"],["dc.identifier.pmid","28785300"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/14774"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/13019"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.relation.eissn","1748-6718"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.title","Pathway-Based Kernel Boosting for the Analysis of Genome-Wide Association Studies"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]
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  • 2017Journal Article
    [["dc.bibliographiccitation.firstpage","75"],["dc.bibliographiccitation.journal","Oral Oncology"],["dc.bibliographiccitation.lastpage","80"],["dc.bibliographiccitation.volume","75"],["dc.contributor.author","Macann, A."],["dc.contributor.author","Fauzi, F."],["dc.contributor.author","Simpson, J."],["dc.contributor.author","Sasso, G."],["dc.contributor.author","Krawitz, H."],["dc.contributor.author","Fraser-Browne, C."],["dc.contributor.author","Manitz, J."],["dc.contributor.author","Raith, A."],["dc.date.accessioned","2020-12-10T15:20:37Z"],["dc.date.available","2020-12-10T15:20:37Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1016/j.oraloncology.2017.10.021"],["dc.identifier.issn","1368-8375"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/72739"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Humidification mitigates acute mucosal toxicity during radiotherapy when factoring volumetric parameters. Trans Tasman Radiation Oncology Group (TROG) RadioHUM 07.03 substudy"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]
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  • 2014Journal Article
    [["dc.bibliographiccitation.firstpage","64"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Human Heredity"],["dc.bibliographiccitation.lastpage","75"],["dc.bibliographiccitation.volume","76"],["dc.contributor.author","Freytag, Saskia"],["dc.contributor.author","Manitz, Juliane"],["dc.contributor.author","Schlather, Martin"],["dc.contributor.author","Kneib, Thomas"],["dc.contributor.author","Amos, Christopher I."],["dc.contributor.author","Risch, Angela"],["dc.contributor.author","Chang-Claude, Jenny"],["dc.contributor.author","Heinrich, Joachim"],["dc.contributor.author","Bickeböller, Heike"],["dc.date.accessioned","2017-09-07T11:47:18Z"],["dc.date.available","2017-09-07T11:47:18Z"],["dc.date.issued","2014"],["dc.description.abstract","Biological pathways provide rich information and biological context on the genetic causes of complex diseases. The logistic kernel machine test integrates prior knowledge on pathways in order to analyze data from genome-wide association studies (GWAS). In this study, the kernel converts the genomic information of 2 individuals into a quantitative value reflecting their genetic similarity. With the selection of the kernel, one implicitly chooses a genetic effect model. Like many other pathway methods, none of the available kernels accounts for the topological structure of the pathway or gene-gene interaction types. However, evidence indicates that connectivity and neighborhood of genes are crucial in the context of GWAS, because genes associated with a disease often interact. Thus, we propose a novel kernel that incorporates the topology of pathways and information on interactions. Using simulation studies, we demonstrate that the proposed method maintains the type I error correctly and can be more effective in the identification of pathways associated with a disease than non-network-based methods. We apply our approach to genome-wide association case-control data on lung cancer and rheumatoid arthritis. We identify some promising new pathways associated with these diseases, which may improve our current understanding of the genetic mechanisms."],["dc.identifier.doi","10.1159/000357567"],["dc.identifier.gro","3149315"],["dc.identifier.pmid","24434848"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/10822"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/5978"],["dc.language.iso","en"],["dc.notes.intern","Kneib Crossref Import"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","public"],["dc.notes.submitter","chake"],["dc.publisher","S. Karger AG"],["dc.relation.eissn","1423-0062"],["dc.relation.issn","0001-5652"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","A Network-Based Kernel Machine Test for the Identification of Risk Pathways in Genome-Wide Association Studies"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]
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  • 2016Journal Article
    [["dc.bibliographiccitation.artnumber","e0164508"],["dc.bibliographiccitation.issue","10"],["dc.bibliographiccitation.journal","PLOS ONE"],["dc.bibliographiccitation.volume","11"],["dc.contributor.author","Tahden, Maike"],["dc.contributor.author","Manitz, Juliane"],["dc.contributor.author","Baumgardt, Klaus"],["dc.contributor.author","Fell, Gerhard"],["dc.contributor.author","Kneib, Thomas"],["dc.contributor.author","Hegasy, Guido"],["dc.date.accessioned","2017-09-07T11:47:15Z"],["dc.date.available","2017-09-07T11:47:15Z"],["dc.date.issued","2016"],["dc.description.abstract","In 2011, a large outbreak of entero-hemorrhagic E. coli (EHEC) and hemolytic uremic syndrome (HUS) occurred in Germany. The City of Hamburg was the first focus of the epidemic and had the highest incidences among all 16 Federal States of Germany. In this article, we present epidemiological characteristics of the Hamburg notification data. Evaluating the epicurves retrospectively, we found that the first epidemiological signal of the outbreak, which was in form of a HUS case cluster, was received by local health authorities when already 99 EHEC and 48 HUS patients had experienced their first symptoms. However, only two EHEC and seven HUS patients had been notified. Middle-aged women had the highest risk for contracting the infection in Hamburg. Furthermore, we studied timeliness of case notification in the course of the outbreak. To analyze the spatial distribution of EHEC/HUS incidences in 100 districts of Hamburg, we mapped cases' residential addresses using geographic information software. We then conducted an ecological study in order to find a statistical model identifying associations between local socio-economic factors and EHEC/HUS incidences in the epidemic. We employed a Bayesian Poisson model with covariates characterizing the Hamburg districts as well as incorporating structured and unstructured spatial effects. The Deviance Information Criterion was used for stepwise variable selection. We applied different modeling approaches by using primary data, transformed data, and preselected subsets of transformed data in order to identify socio-economic factors characterizing districts where EHEC/HUS outbreak cases had their residence."],["dc.identifier.doi","10.1371/journal.pone.0164508"],["dc.identifier.gro","3149308"],["dc.identifier.pmid","27723830"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/13758"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/5970"],["dc.language.iso","en"],["dc.notes.intern","Kneib Crossref Import"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.relation.issn","1932-6203"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0/"],["dc.title","Epidemiological and Ecological Characterization of the EHEC O104:H4 Outbreak in Hamburg, Germany, 2011"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]
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  • 2014Journal Article
    [["dc.bibliographiccitation.journal","PLoS Currents"],["dc.contributor.author","Manitz, Juliane"],["dc.contributor.author","Kneib, Thomas"],["dc.contributor.author","Schlather, Martin"],["dc.contributor.author","Helbing, Dirk"],["dc.contributor.author","Brockmann, Dirk"],["dc.date.accessioned","2017-09-07T11:47:13Z"],["dc.date.available","2017-09-07T11:47:13Z"],["dc.date.issued","2014"],["dc.description.abstract","The key challenge during food-borne disease outbreaks, e.g. the 2011 EHEC/HUS outbreak in Germany, is the design of efficient mitigation strategies based on a timely identification of the outbreak’s spatial origin. Standard public health procedures typically use case-control studies and tracings along food shipping chains. These methods are time-consuming and suffer from biased data collected slowly in patient interviews. Here we apply a recently developed, network-theoretical method to identify the spatial origin of food-borne disease outbreaks. Thereby, the network captures the transportation routes of contaminated foods. The technique only requires spatial information on case reports regularly collected by public health institutions and a model for the underlying food distribution network. The approach is based on the idea of replacing the conventional geographic distance with an effective distance that is derived from the topological structure of the underlying food distribution network. We show that this approach can efficiently identify most probable epicenters of food-borne disease outbreaks. We assess and discuss the method in the context of the 2011 EHEC epidemic. Based on plausible assumptions on the structure of the national food distribution network, the approach can correctly localize the origin of the 2011 German EHEC/HUS outbreak."],["dc.identifier.doi","10.1371/currents.outbreaks.f3fdeb08c5b9de7c09ed9cbcef5f01f2"],["dc.identifier.gro","3149301"],["dc.identifier.pmid","24818065"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/5962"],["dc.language.iso","en"],["dc.notes.intern","Kneib Crossref Import"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.relation.issn","2157-3999"],["dc.title","Origin Detection During Food-borne Disease Outbreaks - A Case Study of the 2011 EHEC/HUS Outbreak in Germany"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]
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  • 2013Journal Article
    [["dc.bibliographiccitation.firstpage","509"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Biometrical Journal"],["dc.bibliographiccitation.lastpage","526"],["dc.bibliographiccitation.volume","55"],["dc.contributor.author","Manitz, Juliane"],["dc.contributor.author","Hoehle, Michael"],["dc.date.accessioned","2018-11-07T09:22:40Z"],["dc.date.available","2018-11-07T09:22:40Z"],["dc.date.issued","2013"],["dc.description.abstract","In infectious disease epidemiology, statistical methods are an indispensable component for the automated detection of outbreaks in routinely collected surveillance data. So far, methodology in this area has been largely of frequentist nature and has increasingly been taking inspiration from statistical process control. The present work is concerned with strengthening Bayesian thinking in this field. We extend the widely used approach of Farrington etal. and Heisterkamp etal. to a modern Bayesian framework within a time series decomposition context. This approach facilitates a direct calculation of the decision-making threshold while taking all sources of uncertainty in both prediction and estimation into account. More importantly, with the methodology it is now also possible to integrate covariate processes, e.g. weather influence, into the outbreak detection. Model inference is performed using fast and efficient integrated nested Laplace approximations, enabling the use of this method in routine surveillance at public health institutions. Performance of the algorithm was investigated by comparing simulations with existing methods as well as by analysing the time series of notified campylobacteriosis cases in Germany for the years 2002-2011, which include absolute humidity as a covariate process. Altogether, a flexible and modern surveillance algorithm is presented with an implementation available through the R package surveillance'."],["dc.identifier.doi","10.1002/bimj.201200141"],["dc.identifier.isi","000325887000004"],["dc.identifier.pmid","23589348"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/29403"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","1521-4036"],["dc.relation.issn","0323-3847"],["dc.title","Bayesian outbreak detection algorithm for monitoring reported cases of campylobacteriosis in Germany"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]
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  • 2016Conference Abstract
    [["dc.bibliographiccitation.firstpage","E327"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","International Journal of Radiation Oncology*Biology*Physics"],["dc.bibliographiccitation.lastpage","E328"],["dc.bibliographiccitation.volume","96"],["dc.contributor.author","Macann, A.M.J."],["dc.contributor.author","Paizi, W.F."],["dc.contributor.author","Simpson, J."],["dc.contributor.author","Sasso, G."],["dc.contributor.author","Krawitz, H."],["dc.contributor.author","Fraser-Browne, C.L."],["dc.contributor.author","Manitz, J."],["dc.contributor.author","Raith, A."],["dc.date.accessioned","2020-12-10T14:24:38Z"],["dc.date.available","2020-12-10T14:24:38Z"],["dc.date.issued","2016"],["dc.format.extent","E327"],["dc.identifier.doi","10.1016/j.ijrobp.2016.06.1452"],["dc.identifier.isi","000387655803121"],["dc.identifier.issn","0360-3016"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/72314"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Inc"],["dc.publisher.place","New york"],["dc.relation.conference","58th Annual Meeting of the American-Society-for-Radiation-Oncology (ASTRO)"],["dc.relation.eventlocation","Boston, MA"],["dc.relation.issn","1879-355X"],["dc.relation.issn","0360-3016"],["dc.title","Humidification Mitigates Mucosal Toxicity During Head and Neck Cancer Radiation Therapy When Factoring Radiation Therapy Dosimetric Parameters: Trans-Tasman Radiation Oncology Group (TROG) 07.03 Substudy"],["dc.type","conference_abstract"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]
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  • 2016Journal Article
    [["dc.bibliographiccitation.firstpage","521"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Journal of the Royal Statistical Society. Series C, Applied statistics"],["dc.bibliographiccitation.lastpage","536"],["dc.bibliographiccitation.volume","66"],["dc.contributor.author","Manitz, Juliane"],["dc.contributor.author","Harbering, Jonas"],["dc.contributor.author","Schmidt, Marie"],["dc.contributor.author","Kneib, Thomas"],["dc.contributor.author","Schoebel, Anita"],["dc.date.accessioned","2017-09-07T11:47:46Z"],["dc.date.available","2017-09-07T11:47:46Z"],["dc.date.issued","2016"],["dc.identifier.doi","10.1111/rssc.12176"],["dc.identifier.gro","3149364"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6033"],["dc.language.iso","en"],["dc.notes.intern","Kneib Crossref Import"],["dc.notes.status","public"],["dc.notes.submitter","chake"],["dc.relation.issn","0035-9254"],["dc.title","Source estimation for propagation processes on complex networks with an application to delays in public transportation systems"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]
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  • 2016Journal Article
    [["dc.bibliographiccitation.firstpage","19"],["dc.bibliographiccitation.journal","Journal of Veterinary Behavior Clinical Applications and Research"],["dc.bibliographiccitation.lastpage","26"],["dc.bibliographiccitation.volume","13"],["dc.contributor.author","Schwarzer, Angela"],["dc.contributor.author","Bergmann, Shana"],["dc.contributor.author","Manitz, Juliane"],["dc.contributor.author","Kuechenhoff, Helmut"],["dc.contributor.author","Erhard, Michael"],["dc.contributor.author","Rauch, Elke"],["dc.date.accessioned","2018-11-07T10:14:38Z"],["dc.date.available","2018-11-07T10:14:38Z"],["dc.date.issued","2016"],["dc.description.abstract","The aims of this study were to investigate whether farmed mink use swimming basins as an environmental enrichment factor and to identify layouts suitable to allow mink to perform their characteristic behavior to a large extent. Furthermore, an assessment of the water quality was intended. In 2006, the German \"Order on the Protection of Animals and the Keeping of Production Animals\" (German designation: Tierschutz-Nutztierhaltungsverordnung) stated mandatory husbandry requirements for fur animals for the first time in Germany. For mink, these include a water basin which is suitable for swimming. Forty American mink (Neovison vison) from a commercial mink farm were housed in 2 identically constructed free-range enclosures at the age of 13 weeks. In each of the 2 enclosures, the mink were offered 3 different water basins, which differed in shape, depth, and surface area and included a rectangular \"swimming pool\" (surface area approximately 20.5 m(2), depth approximately 30 cm), a round \"pond\" (surface area 4.9 m(2), depth approximately 80 cm), and a flowing \"creek\" (surface area 4.0 m(2), length approximately 10.0 m, width 40 cm, depth 3-4 cm). Twenty nest boxes were placed in each enclosure (animal-to-nest box ratio: 1: 1). The animal behavior in both groups was assessed by direct and video observations. Results showed that the mink generally accepted all 3 water basins and used them extensively from the beginning to the end of the study. Descriptive and negative binomial model analysis of water contact counts obtained from direct observations showed that mink preferred the swimming pool. However, in relation to the basin surface area, the preference effect is more pronounced for the pond. Overall, the animals spent a considerable amount of time at and in the water during their main activity time. On average, each mink could be observed 7 minutes per hour (12.0%) at and in the pool or 3 minutes per hour (5.5%) in the pond. The water quality was very good throughout the study. Although the mink used the water frequently, the total bacteria count and the level of Enterobacteriaceae were always very low. There were no traces of salmonella in any water sample. (C) 2016 Elsevier Inc. All rights reserved."],["dc.identifier.doi","10.1016/j.jveb.2016.02.007"],["dc.identifier.isi","000378094700005"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/40654"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Inc"],["dc.relation.issn","1878-7517"],["dc.relation.issn","1558-7878"],["dc.title","Behavioral studies on the use of open water basins by American mink (Neovison vison)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]
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