title: [Not whether, but how many].
authors.forename: Dag
authors.initials: D
authors.lastname: Bruusgaard
mesh_terms: D004185:Disability Evaluation; D006801:Humans; D009140:Musculoskeletal Diseases / Q000175:diagnosis / Q000534:rehabilitation; D010146:Pain / Q000175:diagnosis / Q000534:rehabilitation; D010147:Pain Measurement; D018582:Sick Leave