[1] Univ Appl Sci, Res Unit, CH-1700 Fribourg, Switzerland
[2] Univ Bern, Psychiat Serv, CH-3000 Bern, Switzerland
[3] Univ Maastricht, Fac Hlth Sci, NL-6200 MD Maastricht, Netherlands
[4] Humboldt Univ, Dept Nursing Sci, D-10117 Berlin, Germany
[5] Schloessli Private HospPsychiat & Psychotherapy, CH-8618 Oetwil am See, Switzerland
[6] ETH Zentrum, Swiss Fed Inst Technol, Dept Behav Sci, CH-8092 Zurich, Switzerland