Figures 1 and 2 were first presented in Scandinavian Journal of Rheumatology, 38(2):144- 148, 2009. They are included in this thesis with permission from Scandinavian Journal of Rheumatology.
Figures 3, 4 and 5 were first presented in the Journal of Rheumatology, 33(10): 2020-2025, 2006. They are included in this thesis with permission from the Journal of Rheumatology.