Affiliation: | 1.Department of Rheumatology,Diakonhjemmet Hospital,Vinderen,Oslo,Norway;2.Department of Rheumatology,Leiden University Medical Center,Leiden,The Netherlands;3.Department of Rheumatology,?stfold Hospital Trust,Fredrikstad,Norway;4.Lillehammer Hospital for Rheumatic Diseases,Margrethe Grundtvigs vei 6,Lillehammer,Norway;5.Department of Rheumatology,Innlandet Hospital,Kongsvinger,Norway;6.Martina Hansen Hospital,B?rum Postal Terminal,Norway |