1. Diabetes Division, St Josef‐Hospital Ruhr‐University Bochum Bochum Germany
2. Department of Internal Medicine, Gastroenterology and Diabetes Augusta Clinic Bochum Bochum Germany
3. Department of Biomedical Sciences and NovoNordisk Centre for Basic Metabolic Research, Faculty of Health and Medical Sciences University of Copenhagen, Panum Institute Copenhagen Denmark
4. Profil Mainz Germany
5. Profil Neuss Germany