From the *Department of Rheumatology, Østfold Hospital Trust, Norway; †Department of Physical Medicine and Rehabilitation, Division for Neuroscience and Musculoskeletal Medicine, Ullevaal University Hospital, Oslo; ‡Section of Occupational Health and Social Insurance Medicine, Institute of General Practice and Community Health, University of Oslo, Oslo; §Section for Back Surgery and Physical Medicine and Rehabilitation, Department of Orthopaedics, Rikshospitalet University Hospital, Oslo. ¶Unifob Health, University of Bergen, Bergen, Norway; ∥FORMI (Communication Unit for Musculoskeletal Disorders), Division for Neuroscience and Musculoskeletal Medicine, Ullevaal University Hospital, Oslo; and **National Resource Centre for Rehabilitation in Rheumatology, Diakonhjemmet Hospital, Oslo.
Acknowledgment date: October 19, 2007. First revision date: March 4, 2008. Second revision date: May 3, 2008. Acceptance date: May 5, 2008.
The manuscript submitted does not contain information about medical device(s)/drug(s).
Institutional funds were received in support of this work. No benefits in any form have been or will be received from a commercial party related directly or indirectly to the subject of this manuscript.
Supported by a grant from the Eastern Norway Regional Health Authority.
The study protocol was approved by the Regional Committee for Medical Research Ethics, Oslo (October 11, 2004) and The Ombudsman for Privacy in Research at the Norwegian Social Science Data Services (March 2, 2005).
Address correspondence and reprint requests to Lars Grøvle, MD, Revmatologisk avdeling, Sykehuset Østfold, 1702 Sarpsborg, Norway; E-mail: [email protected]
