[1] Univ Oslo, Norwegian Inst Drug & Alcohol Res SIRUS, N-0316 Oslo, Norway
[2] Univ Oslo, Inst Hlth & Soc, N-0316 Oslo, Norway
[3] Ctr Study Profess, Oslo, Norway
[4] Akershus Univ, Coll Appl Sci, Nordbyhagen, Norway
[5] Univ Oslo, Ctr Study Mind Nat, N-0316 Oslo, Norway