[1] Univ Stavanger, Fac Hlth Sci, Dept Publ Hlth, N-4036 Stavanger, Norway
[2] OsloMet Oslo Metropolitan Univ, Fac Hlth Sci, Dept Occupat Therapy Prosthet & Orthot, N-0130 Oslo, Norway
[3] Norwegian Inst Publ Hlth, Dept Hlth Promot, N-5015 Bergen, Norway
[4] Stavanger Univ Hosp, Alcohol & Drug Res Western Norway, N-4010 Stavanger, Norway
[5] Univ Texas Hlth Sci Houston, Sch Publ Hlth San Antonio, Dept Epidemiol Human Genet & Environm Sci, Southwest Ctr Occupat & Environm Hlth, Houston, TX 77229 USA
[6] Univ Pompeu Fabra, Ctr Res Occupat Hlth CiSAL, Barcelona 08002, Spain
[7] CIBER Epidemiol & Publ Hlth, Madrid 28029, Spain