title: Invited commentary.
authors.affiliation: Arthritis Research UK Primary Care Centre, Primary Care Sciences, Keele University, Keele, Staffordshire, ST5 5BG, United Kingdom. j.hill@cphc.keele.ac.uk
authors.forename: Jonathan C
authors.initials: JC
authors.lastname: Hill
authors.forename: Elaine M
authors.initials: EM
authors.lastname: Hay
mesh_terms: D004185:Disability Evaluation; D006801:Humans; D017116:Low Back Pain / Q000175:diagnosis* / Q000534:rehabilitation*; D010147:Pain Measurement; D026741:Physical Therapy Modalities; D011379:Prognosis; D012107:Research Design; D018570:Risk Assessment; D013223:Statistics as Topic