1. Department of Internal Medicine III, Gastroenterology and Hepatology Medical University of Vienna Vienna Austria
2. Department of Internal Medicine IV Medical University of Heidelberg Heidelberg Germany
3. Second Department of Neurology, Institute of Psychiatry and Neurology, and Department of Pharmacology Medical University of Warsaw Poland
4. First Department of Internal Medicine Semmelweis University Budapest Hungary
5. First Department of Internal Medicine Medical University Innsbruck Austria
6. Fourth Medical Department, First Faculty of Medicine Charles University Prague Czech Republic
7. Wilhelmina Children’s Hospital, University Medical Center Utrecht the Netherlands
8. Second Pediatric Clinic University of Medicine and Pharmacy “Iuliu Hatieganu” Cluj‐Napoca Romania
9. Department of Internal Medicine Medical University of Graz Graz Austria
10. Internal Medicine 4 Wilhelminen hospital Vienna Austria
11. Department of Gastroenterology and Hepatology Ankara University Medical School Ankara Turkey
12. Department of Internal Medicine I Paracelsus Medical University Salzburg Austria
13. Department of Clinical Pathology Medical University of Vienna Austria