1. University of Oslo; Section for Health Science; P.O.box 1153, Blindern Gydas vei 8 Oslo Norway 0316
2. Diakonhjemmet Hospital; National Resource Centre for Rehabilitation in Rheumatology; PO Box 23 Vindern 0319 Oslo Norway
3. Diakonhjemmet Hospital; Department of Rheumatology; P.O box 23, Vinderen Borgenveien 3c Oslo Norway 0319