[1] Univ Wurzburg, Dept Med 1, Endocrinol & Diabet Unit, D-97080 Wurzburg, Germany
[2] Charite Univ Med Berlin, Dept Med Gastroenterol Hepatol & Endocrinol, D-10117 Berlin, Germany
[3] Univ Hosp Leipzig, Dept Psychotherapy & Psychosomat Med, D-04103 Leipzig, Germany
[4] Univ Birmingham, Div Med Sci, Birmingham B29 7EX, W Midlands, England