[1] Univ Hosp Wurzburg, Dept Med Endocrinol & Diabetol 1, Wurzburg, Germany
[2] Charite Univ Med Berlin, Dept Clin Endocrinol, Berlin, Germany
[3] Univ Hosp Dusseldorf, Dept Endocrinol & Diabetol, Cologne, Germany
[4] Univ Munich, Klinikum Univ Munchen, Med Klin & Poliklin 4, D-81377 Munich, Germany