Randi Ulberg1, Hanne-Sofie Johnsen Dahl2. 1. Institute of Clinical Medicine, University of Oslo, Box 85, Vinderen, 0319 Oslo, Norway; Research Unit, Division of Mental Health and Addiction, Vestfold Hospital Trust, Tønsberg, Norway. Electronic address: randi.ulberg@medisin.uio.no. 2. Research Unit, Division of Mental Health and Addiction, Vestfold Hospital Trust, Tønsberg, Norway.