[1] Hosp Sierrallana, Torrelavega, Spain
[2] Hosp Valdecilla, Santander, Spain
[3] Hosp Doctor Negrin, Las Palmas Gran Canaria, Spain
[4] Unidad Invest SER, Madrid, Spain
[5] Hosp 12 Octubre, Madrid, Spain
[6] Hosp Gregorio Maranon, Madrid, Spain
[7] Hosp Badalona Germans Trias & Pujol, Badalona, Spain
[8] Hosp Carlos Haya, Malaga, Spain
[9] Hosp Univ Araba, Vitoria, Spain
[10] Hosp Univ Jerez, El Puerto De Santa Maria, Spain
[11] Hosp Univ Princesa, Madrid, Spain
[12] Hosp Univ Donosti, San Sebastian, Spain
[13] Hosp Univ Ramon & Cajal, Madrid, Spain
[14] Hosp Gen Univ Alicante, Alicante, Spain
[15] Hosp Univ Juan Canalejo, La Coruna, Spain
[16] Hosp Marina Baixa, Villajoyosa, Spain
[17] Hosp Univ Basurto, Bilbao, Spain
[18] Hosp Univ Son Llatzer, Palma De Mallorca, Spain
[19] Hosp Santa Creu & Sant Pau, Barcelona, Spain
[20] Hosp Parc Tauli, Barcelona, Spain
[21] Hosp Comarcal Monforte, Monforte, Spain
[22] Hosp Univ Clin San Cecilio, Granada, Spain
[23] Hosp Univ Bellvitge, Dept Rheumatol, Catalonia, Barcelona, Spain
[24] Hosp Univ Canarias, Las Palmas Gran Canaria, Spain
[25] Hosp Insular Univ Gran Canaria, Las Palmas Gran Canaria, Spain
[26] Complejo Hosp Univ Navarra, Pamplona, Spain
[27] Rheumatol Dept Hosp Sierrallana, Torrelavega, Spain
[28] Complexo Hosp Univ, Vigo, Spain