1. Endocrinology, Diabetology and Metabolism, Department of Internal Medicine and Department of Clinical Research University Hospital Basel Basel Switzerland
2. Department of General Internal & Emergency Medicine and Department of Endocrinology, Diabetology and Clinical Nutrition Medical University Clinic, Kantonsspital Aarau Aarau Switzerland
3. Institute of Primary Health Care (BIHAM) University of Bern Bern Switzerland
4. Department of General Internal Medicine, Inselspital, Bern University Hospital University of Bern Bern Switzerland
5. Department of Clinical Research, Basel Institute for Clinical Epidemiology and Biostatistics University Hospital Basel and University of Basel Basel Switzerland
6. Department of Clinical Epidemiology and Biostatistics McMaster University Hamilton Ontario Canada