[1] Univ Oslo, Dept Res & Educ, Div Psychiat, Oslo, Norway
[2] Univ Oslo, Dept Cardiol, Outpatient Clin, Oslo, Norway
[3] Univ Oslo, Ullevaal Univ Hosp, Fac Div, Oslo, Norway
[4] Univ Oslo, Inst Psychiat, Oslo, Norway
[5] Univ Oslo, Dept Behav Sci Med, Oslo, Norway