[1] Hosp Univ La Paz, Rheumatol, Madrid, Spain
[2] IRCCS S Maria Nuova, Rheumatol, Reggio Emilia, Italy
[3] Univ Siena, Dept Med Surg & Neurosci, Rheumatol, Siena, Italy
[4] Ist Sci San Raffaele, Rheumatol, Milan, Italy
[5] Med Univ Plovdiv, Univ Hosp Kaspela, Rheumatol, Plovdiv, Bulgaria
[6] Univ Pavia, IRCCS Policlin S Matteo Fdn, Rheumatol, Pavia, Italy
[7] Hosp Santa Maria, Ctr Hosp Univ Lisboa Norte EPE, Rheumatol, Lisbon, Portugal
[8] Hosp Univ La Paz, Rheumatol, Madrid, Spain
[9] Univ Med Ctr Ljubljana, Rheumatol, Ljubljana, Slovenia