[1] Univ Groningen, Dept Psychiat & Internal Med, NL-9700 RB Groningen, Netherlands
[2] VU Hosp Amsterdam, Dept Psychiat, Groningen, Netherlands
[3] Acad Hosp Groningen, Groningen, Netherlands
[4] Univ Groningen Hosp, Dept Internal Med, NL-9713 EZ Groningen, Netherlands
[5] Gen Hosp Nuremberg, Dept Psychosomat & Psychotherapy, Nurnberg, Germany
[6] Univ Lausanne Hosp, Dept Psychiat, Lausanne, Switzerland