1. Department of Internal Medicine, Division of Endocrinology and Diabetes, University Hospital of Zurich, Zurich, Switzerland
2. Medizinische Klinik, Endokrinologie und Diabetologie Kantonsspilal Frauenfeld, Frauenfeld, Switzerland
3. Department of Internal Medicine, Medical Policlinic, University Hospital of Zurich, Zurich, Switzerland
4. Department of Biostatistics, University of Zurich, Zurich, Switzerland