[1] Univ Southern Denmark, Dept Sports Sci & Clin Biomech, Campusvej 55, DK-5230 Odense M, Denmark
[2] Danish Hlth Author, Evidence Educ & Emergency Serv, Islands Brygge 67, DK-2300 Copenhagen S, Denmark
[3] Univ Southern Denmark, Nord Inst Chiropract & Clin Biomech, Campusvej 55, DK-5230 Odense M, Denmark
[4] Hosp Lillebaelt, Spine Ctr Southern Denmark, Ctr Spine Surg & Res, Ostre Houghvej 55, DK-5500 Middelfart, Denmark
[5] Hosp Lillebaelt, Spine Ctr Southern Denmark, Ostre Houghvej 55, DK-5500 Middelfart, Denmark
[6] Univ Southern Denmark, Inst Reg Hlth Res, Campusvej 55, Odense M, Denmark
[7] Kobenhavns Fysioterapi I S, JE Ohlsens Gade 2,1th, DK-2100 Copenhagen O, Denmark
[8] CFR Hosp, Hans Bekkevolds Allee 2B, DK-2900 Hellerup, Denmark
[9] Danish Inst Local & Reg Govt Res, KORA, Kobmagergade 22, DK-1150 Copenhagen K, Denmark
[10] Ctr Rheumatol & Spine Dis, Dyrehavevej 29, DK-3400 Hillerod, Denmark
[11] Rigshosp, Nord Cochrane Ctr, 7811,Blegdamsvej 9, DK-2100 Copenhagen O, Denmark
[12] Rigshosp, Dept Ortopaed Surg, Spine Unit, Copenhagen, Denmark
[13] Aalborg Univ, Dept Clin Med, Res Unit Gen Practice Aalborg, Fyrkildevej 7,1, DK-9220 Aalborg O, Denmark
[14] Aalborg Rygklin, Aalborg Spine Clin, Vingaardsgade 9, DK-9000 Aalborg, Denmark
[15] Aarhus Univ Hosp, Neurosurg Dept, DK-8000 Aarhus C, Denmark
[16] Aalborg Univ, SMI, Dept Hlth Sci & Technol, Aalborg, Denmark
[17] Univ Coll Northern Denmark UCN, Dept Physiotherapy, Aalborg, Denmark
[18] Rigshosp, Res & Test Ctr Hlth Technol, Nordre Ringvej 57 Opgang 8,5 Sal, DK-2600 Glostrup, Denmark