[1] Vrije Univ, Dept Hlth Sci, Fac Sci, De Boelelaan 1085,Room WN U601, NL-1081 HV Amsterdam, Netherlands
[2] Vrije Univ, Amsterdam Movement Sci, Fac Sci, De Boelelaan 1085,Room WN U601, NL-1081 HV Amsterdam, Netherlands
[3] Vrije Univ, Fac Sci, Amsterdam Publ Hlth Res Inst, Amsterdam, Netherlands
[4] Karolinska Inst, Inst Environm Med, Unit Intervent & Implementat Res Worker Hlth, Stockholm, Sweden
[5] Macquarie Univ, Fac Sci & Engn, Dept Chiropract, Sydney, NSW, Australia
[6] Private Practice, Back Act, Portsmouth, Hants, England
[7] AECC Univ Coll, Bournemouth, Dorset, England
[8] Univ Southern Denmark, Dept Sports Sci & Clin Biomech, Odense M, Denmark
[9] Univ Southern Denmark, Nordic Inst Chiropract & Clin Biomech, Odense, Denmark
[10] Erasmus MC, Dept Gen Practice, Rotterdam, Netherlands
[11] Univ Southern Denmark, Ctr Muscle & Joint Hlth, Odense, Denmark
[12] Aarhus Univ Hosp, Dept Physiotherapy & Occupat Therapy, Aarhus, Denmark