[1] Stavanger Univ Hosp, Ctr Alcohol & Drug Res KORFOR, Stavanger, Norway
[2] Stavanger Univ Hosp, Norwegian Ctr Movement Disorders, Stavanger, Norway
[3] Univ Stavanger, Dept Social Studies, Stavanger, Norway
[4] Univ Bergen, Dept Biol & Med Psychol, Bergen, Norway
[5] Helse Fonna HF, Dept Res & Innovat, Haugesund, Norway