1. Doctor Negrín Hospital of Gran Canaria; Spain
2. Infanta Sofía Hospital; Madrid Spain
3. Puerta de Hierro-Majadahonda Hospital; Madrid Spain
4. Spanish Society of Rheumatology; Madrid Spain
5. Marqués de Valdecilla Hospital; Santander Spain
6. Germans Trias i Pujol Hospital; Barcelona Spain
7. Gregorio Marañón Hospital; Madrid Spain
8. Marina Baixa Hospital; Villajoyosa Alicante Spain
9. 12 Octubre Hospital; Madrid Spain
10. Araba Hospital; Vitoria Spain
11. Carlos Haya Hospital; Málaga Spain
12. University Hospital of Canarias; Tenerife Spain
13. La Princesa Hospital; Madrid Spain
14. Jerez de la Frontera General Hospital; Cádiz Spain
15. Bellvitge Hospital; Barcelona Spain
16. Virgen de la Salud Hospital; Toledo Spain
17. Navarra Hospital; Pamplona Spain
18. Donosti Hospital; San Sebastián Spain
19. Alicante General Hospital; Spain
20. Virgen de la Concha Hospital; Zamora Spain
21. Ramón y Cajal Hospital; Madrid Spain
22. Juan Canalejo Hospital; A Coruña Spain
23. Parc-Taulí Hospital; Barcelona Spain
24. Hospital Complex of Orense; Spain
25. León Hospital; León Spain
26. Hospital Complex of Vigo and Instituto de Investigación Sanitaria Galicia Sur; Vigo Spain