[1] Metroplex Clin Res Ctr, Dallas, TX USA
[2] Hosp Cruces, Baracaldo, Spain
[3] Med Univ Bialystok, Bialystok, Poland
[4] Gabinet InternistycznoReumatol, Bialystok, Poland
[5] Inland Rheumatol, Upland, CA USA
[6] Boehringer Ingelheim GmbH & Co KG, Ingelheim, Germany