[1] Univ Lublin, Sch Med, Lublin, Poland
[2] Krakowski Szpital Reumatol & Rehabil, Krakow, Poland
[3] Univ Vilnus, Dept Rheumatol, Vilnus, Lithuania
[4] Univ Heidelberg, Med Klin & Poliklin 5, Heidelberg, Germany
[5] Med Hsch Hannover, Abt Rheumatol, Hannover, Germany