1. Helsinki University Hospital, Psychiatry Center, Helsinki, Finland; University of Tampere, School of Health Sciences, Nursing Science, Tampere, Finland
2. Niuvanniemi Hospital, Kuopio, Finland
3. Helsinki University Hospital, Helsinki, Finland
4. Vanha Vaasa Hospital, Vaasa, Finland
5. University of Tampere, School of Health Sciences, Nursing Science, Tampere, Finland