[1] Univ Hosp Oulu, Dept Phys Med & Rehabil, Oulu 90029, Finland
[2] Oulu Deaconess Inst, Dept Rehabil, Oulu 90120, Finland
[3] Oulu Univ Hosp, Dept Surg, Oulu 90029, Finland
[4] Oulu Univ Hosp, Dept Anesthesiol, Oulu 90029, Finland
[5] Univ Helsinki, Dept Publ Hlth, Hjelt Inst, Helsinki 00014, Finland
[6] Kuopio Univ Hosp, Dept Phys Med & Rehabil, Kuopio 70211, Finland
[7] Univ Kuopio, Inst Clin Med, FIN-70211 Kuopio, Finland