1. Holy Spirit Hospital, Kempen, Germany.
2. Institute of Epidemiology and Medical Biometry, ZIBMT, Ulm University, Ulm, Germany.
3. German Center for Diabetes Research (DZD), Munich-Neuherberg, Germany.
4. Department of Pediatrics, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany.
5. Department of Diabetes, Endocrinology, Nutritional Medicine and Metabolism, Inselspital, Bern University Hospital and University of Bern, Bern, Switzerland.
6. Department of General Internal Medicine, Endocrinology and Diabetology, Helios Clinic Schwerin, Schwerin, Germany.
7. Wilhelminenspital, 5th Medical Clinic, University of Vienna, Vienna, Austria.
8. Diabetes Center Bad Aibling, Bad Aibling, Germany.
9. Department of Internal Medicine, Medius-Clinic, Ostfildern-Ruit, Germany.
10. Institute for Pharmacology and Preventive Medicine, Cloppenburg, Germany.
11. Diabetes Center for Children and Adolescents, Kinder-und Jugendkrankenhaus AUF DER BULT, Hannover, Germany.