[1] Virginia Commonwealth Univ, Div Epidemiol, Dept Family Med & Populat Hlth, Richmond, VA USA
[2] Oslo Univ Hosp, Dept Phys Med & Rehabil, Oslo, Norway
[3] Univ Oslo, Inst Hlth & Soc, Res Ctr Habilitat & Rehabil Models & Serv CHARM, Fac Med, Oslo, Norway
[4] Univ Oslo, Inst Clin Med, Fac Med, Oslo, Norway
[5] OsloMet Oslo Metropolitan Univ, Inst Rehabil Sci & Hlth Technol, Fac Hlth Sci, Oslo, Norway
[6] Univ Oslo, Dept Psychol, Fac Social Sci, Oslo, Norway
[7] Sunnaas Rehabil Hosp, Res Dept, Bjornemyr, Norway