1. Department of Nutrition and Food Science, Nutritional Physiology, University of Bonn, Bonn, Germany
2. Department of Bariatric, Metabolic and Plastic Surgery, St. Franziskus Hospital, Cologne, Germany
3. Department of Nutrition and Food Science, Nutrition and Microbiome, University of Bonn, Bonn, Germany
4. Bonn Education Association for Dietetics r.A., Cologne, Germany
5. Institute of Medical Biometry, Informatics and Epidemiology, University Hospital Bonn, Bonn, Germany
6. Institute of Nutritional Medicine, University of Hohenheim, Stuttgart, Germany
7. Department of Gastroenterology, Metabolic Disorders and Internal Intensive Care (Department of Medicine III), University Hospital RWTH Aachen, Aachen, Germany