1. Department of Endocrinology, Diabetology and Clinical Nutrition,
University Hospital Zurich and University of Zurich, Zurich,
Switzerland
2. Institute for Clinical Chemistry, University Hospital Zurich and
University of Zurich, Zurich, Switzerland
3. Medizinische Klinik und Poliklinik IV, Klinikum der Universität
München, Munich, Germany
4. Department of Internal Medicine III, University Hospital Carl Gustav
Carus, Technische Universität Dresden, Dresden, Germany