[1] Tech Univ Munich, Dept Psychosomat Med, D-8000 Munich, Germany
[2] Hannover Med Sch, Dept Psychosomat Med, Hannover, Germany
[3] Univ Manchester, Dept Psychol Med, Manchester M13 9PL, Lancs, England
[4] Univ Hosp Giessen, Dept Psychosomat Med, Giessen, Germany
[5] Univ Dusseldorf, Coordinat Ctr Clin Trials, D-4000 Dusseldorf, Germany
[6] Univ Heidelberg, Dept Psychosomat Med, D-6900 Heidelberg, Germany
[7] Henriettenstiftung Hannover, Dept Psychosomat Med, Hannover, Germany
[8] Univ Hosp Munster, Dept Psychosomat Med, Munster, Germany