[1] Univ Klinikum Tubingen, Abt Psychosomat Med & Psychotherapie, Tubingen, Germany
[2] Univ Klinikum Ulm, Klin Psychosomat Med & Psychotherapie, Ulm, Germany
[3] Univ Ulm, Klin Psychiat & Psychotherapie 2, Kooperat Klin, Univ Klinikums Ulm, Ulm, Germany
[4] Univ Klinikum Tubingen, Inst Klin Epidemiol & Angew Biometrie, Tubingen, Germany