This research was financially supported by grant 100-003-021 from ZonMw, the Netherlands organization for health research and development; by funds from De Open Ankh; and by the following mental health organizations: GGZ Delfland, GGZ Drenthe, GGZ Dijk en Duin, GGZ Noord-Holland Noord, GGZ Noord- en Midden-Limburg, InGeest, Rivierduinen, and Parnassia Bavo Group.
The authors report no competing interests.