[1] Inst Work & Hlth, Cochrane Back & Neck Grp, 481 Univ Ave,Suite 800, Toronto, ON M5G 2E9, Canada
[2] Inst Hlth & Welf, Ctr Hlth & Social Econ, Helsinki, Finland
[3] Oulu Univ, Oulu, Finland
[4] Oregon Hlth & Sci Univ, Sch Med, Dept Med, Portland, OR 97201 USA
[5] Oregon Hlth & Sci Univ, Sch Med, Dept Med Informat & Clin Epidemiol, Portland, OR 97201 USA
[6] Univ Sydney, George Inst Global Hlth, Sydney, NSW 2006, Australia
[7] Oregon Hlth & Sci Univ, Portland, OR 97201 USA
[8] Univ Minnesota, Ctr Spiritual & Healing, Integrat Hlth & Wellbeing Res Program, Minneapolis, MN USA
[9] Vrije Univ Amsterdam, Fac Earth & Life Sci, Dept Hlth Sci, Amsterdam, Netherlands