1. Diakonhjemmet Hospital; National Advisory Unit on Rehabilitation in Rheumatology; Boks 23 Vinderen Oslo Oslo Norway 0319
2. Norwegian Institute of Public Health; PO BOX 4404 Nydalen Oslo N-0403 Norway
3. Diakonhjemmet Hospital; Department of Rheumatology; Boks 23 Vinderen Oslo Oslo Norway 0319