[1] Univ Hosp Psychiat Zurich, Directorate Nursing Therapies & Social Work, Lenggstr 31,POB 363, CH-8032 Zurich, Switzerland
[2] Univ Hosp Psychiat Zurich, Ctr Acute Psychiat Disorders, Dept Psychiat Psychotherapy & Psychosomat, Lenggstr 31,POB 363, CH-8032 Zurich, Switzerland
[3] Univ Basel, Psychiat Hosp, Dept Dev & Res Nursing Therapies & Social Work, Wilhelm Klein Str 27, CH-4002 Basel, Switzerland
[4] Swiss Fed Inst Technol, Dept Humanities Social & Polit Sci, Chair Social Networks, Weinbergstr 109, CH-8092 Zurich, Switzerland
[5] Univ Ulm, Clin Psychiat & Psychotherapy 1, Ctr Psychiat Suedwuerttemberg, Weingartshofer Str 2, D-88214 Ravensburg, Germany
[6] Univ Med Ctr Hamburg Eppendorf, Dept Psychiat & Psychotherapy, Martinistr 52, D-20246 Hamburg, Germany
[7] Private Clin Psychiat & Psychotherapy Kilchberg, Dept Nursing Dev, Alte Landstr 70, CH-8802 Kilchberg, Switzerland
[8] Univ Bern, Nursing & Social Educ Res Unit, Psychiat Serv Berne, Bolligenstr 111, CH-3000 Bern 60, Switzerland