[1] Univ Cologne, Fac Med Cologne, Cologne, Germany
[2] Univ Hosp Cologne, Ctr Endocrinol Diabet & Prevent Med, Cologne, Germany
[3] Univ Palermo, Dept Hlth Promot Mother & Child Care, Internal Med & Med Specialties, Palermo, Italy
[4] Hietzing Hosp, Dept Med III, Vienna, Austria
[5] Karl Landsteiner Inst Metab Dis & Nephrol, Vienna, Austria
[6] Univ Hosp Leuven, Dept Cardiovasc Med, Leuven, Belgium
[7] Dauchi Sankyo Europe GmbH, Munich, Germany
[8] Hosp Univ Bellvitge Idibell UB CiberObn, Dept Internal Med, Barcelona, Spain
[9] Ludwig Maximilians Univ Munchen, LMU Klinikum Med Dept, 4 Grosshadern, Munich, Germany