1. Department of Dermatology, Medical Center – University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany;
2. Department of Medicine II, Gastroenterology, Hepatology, Endocrinology and Infectious Diseases, Medical Center – University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany;
3. Department of Dermatology, Royal Melbourne Hospital, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Parkville, Australia;
4. Department of Medicine, Institute of Exercise and Occupational Medicine, Medical Center – University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany;
5. Kliniken des Landkreises Lörrach GmbH, Gastroenterology, Germany;
6. Institute of Clinical Pathology, Medical Center – University of Freiburg, Freiburg, Germany