1. Division of Endocrinology, Diabetes and Metabolism, University Department of Medicine, Kantonsspital Aarau, Aarau, Switzerland
2. Division of General and Emergency Medicine, University Department of Medicine, Kantonsspital Aarau, Aarau, Switzerland
3. Department of Visceral Surgery, Clarunis University Center for Gastrointestinal and Liver Diseases, Basel, Switzerland
4. Department of Clinical Research, University of Basel, Basel, Switzerland
5. Department of Visceral Surgery, Kantonsspital Aarau, Aarau, Switzerland.