[1] Altrecht Inst Mental Hlth Care, Dept Bipolar Disorders, Lange Nieuwstr 119, NL-3512 PG Utrecht, Netherlands
[2] Nederlandse Rode Kruis Verenigingskantoor, Anna van Saksenlaan 50, NL-2593 HT The Hague, Netherlands
[3] Vrije Univ Amsterdam, Athena Inst, Fac Earth & Life Sci, Amsterdam UMC, Boelelaan 1085, NL-1081 HV Amsterdam, Netherlands
[4] Vrije Univ, Amsterdam Publ Mental Hlth Res Inst, Dept Psychiat, Amsterdam UMC, Oldenaller 1, NL-1081 HJ Amsterdam, Netherlands