1. Department of Biological Safety German Federal Institute for Risk Assessment Berlin Germany
2. Brandenburg Medical School Institute of Laboratory Medicine Brandenburg Hospital Brandenburg Germany
3. Practice for Gastroenterology Brandenburg Germany
4. Practice for Gastroenterology Bad Belzig Germany
5. Practice for Gastroenterology Berlin Germany
6. Faculty of Medicine Institute of Medical Microbiology and Hygiene Medical Center‐University of Freiburg Freiburg Germany