[1] Univ Oslo, Dept Psychol, Blindern, N-0317 Oslo, Norway
[2] Oslo Univ Hosp, Dept Clin Neurosci Children, Oslo, Norway
[3] St Olavs Univ Hosp, Childrens Clin, Trondheim, Norway
[4] NTNU, Dept Clin & Mol Med, Trondheim, Norway
[5] Oslo Univ Hosp, Psychosomat Med & Clin Psychiat, Oslo, Norway
[6] Lovisenberg Diaconal Hosp, Dept Res, Oslo, Norway