[1] Univ Zurich, Hosp Psychiat, CH-8029 Zurich, Switzerland
[2] Goethe Univ Frankfurt, Ctr Psychiat, Dept Psychosomat Med & Psychotherapy, D-6000 Frankfurt, Germany
[3] Humboldt Univ, Dept Psychosomat Med & Psychotherapy, Charite Virchow Klinikum, Berlin, Germany
[4] Otto Von Guericke Univ, Hosp Psychiat, Magdeburg, Germany