[1] Helse Forde, Sect Rheumatol, Forde, Norway
[2] Dept Neurol Rheumatol & Phys Med, Forde, Norway
[3] Inst Informat Silesian Univ Technol, Dept Graph Comp Vis & Digital Syst, Gliwice, Poland
[4] Western Norway Univ Appl Sci, Fac Sci & Engn, Forde, Norway