1. Department of Endocrinology, Diabetes and Rheumatology; University Hospital Duesseldorf; Duesseldorf; Germany
2. Department of Prevention and Sports Medicine, Klinikum rechts der Isar; Technische Universitaet Muenchen; Munich; Germany
3. Institute for Laboratory Medicine, Deutsches Herzzentrum Muenchen; Technische Universitaet Muenchen; Munich; Germany