Seasonal variability of vitamin D status in patients with inflammatory bowel disease – A retrospective cohort study

• Christine Elisabeth Janssen ,

  Contributed equally to this work with: Christine Elisabeth Janssen, Anna Maria Globig

  Roles Conceptualization, Data curation, Formal analysis, Investigation, Writing – original draft

  Affiliation Department of Medicine II, Medical Center–University of Freiburg, Faculty of Medicine, University of Freiburg, Germany

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• Anna Maria Globig ,

  Contributed equally to this work with: Christine Elisabeth Janssen, Anna Maria Globig

  Roles Formal analysis, Investigation, Methodology, Writing – original draft, Writing – review & editing

  Affiliations Department of Medicine II, Medical Center–University of Freiburg, Faculty of Medicine, University of Freiburg, Germany, Berta-Ottenstein-Programme, Faculty of Medicine, University of Freiburg, Germany

  http://orcid.org/0000-0002-5236-7459

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• Andrea Busse Grawitz,

  Roles Investigation

  Affiliation Institute for Clinical Chemistry and Laboratory Medicine, Medical Center—University of Freiburg, Faculty of Medicine, University of Freiburg, Germany

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• Dominik Bettinger,

  Roles Formal analysis

  Affiliations Department of Medicine II, Medical Center–University of Freiburg, Faculty of Medicine, University of Freiburg, Germany, Berta-Ottenstein-Programme, Faculty of Medicine, University of Freiburg, Germany

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• Peter Hasselblatt

  Roles Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Project administration, Supervision, Writing – original draft, Writing – review & editing

  * E-mail: Peter.Hasselblatt@uniklinik-freiburg.de

  Affiliation Department of Medicine II, Medical Center–University of Freiburg, Faculty of Medicine, University of Freiburg, Germany

  http://orcid.org/0000-0002-1107-6516

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