Affiliation: | 1.Dept of Rheumatology, Diakonhjemmet Hospital, Box 23, 0319 Oslo, Norway;2.Blood Bank and Dept of Immunology, Oslo University Hospital, Ullevål Hospital, Kirkeveien 166, 0450 Oslo, Norway;3.Dept of Internal Medicine, Oslo University Hospital, Rikshospitalet, Sognsvannsveien 20, 0372 Oslo, Norway |