[1] Naestved Slagelse Ringsted Hosp, Dept Physiotherapy & Occupat Therapy, Naestved, Denmark
[2] Naestved Slagelse Ringsted Hosp, Dept Resp Med, Naestved, Denmark
[3] Naestved Slagelse Ringsted Hosp, Dept Physiotherapy & Occupat Therapy, Slagelse, Denmark
[4] Univ Southampton, Dept Primary Care Res, Southampton, Hants, England
[5] Zealand Univ Hosp, Dept Rheumatol, Koge, Denmark