1 M.A. González-Gay, MD, PhD, Medicine and Psychiatry Department, University of Cantabria, Santander, and Division of Rheumatology, IIS-Fundación Jiménez Díaz, Madrid; miguelaggay@hotmail.com.
2 S. Castañeda, MD, PhD, Division of Rheumatology, Hospital Universitario de La Princesa, IIS-Princesa, Madrid.
3 I. Ferraz-Amaro, MD, PhD, Division of Rheumatology, Hospital Universitario de Canarias, and Department of Internal Medicine, Universidad de La Laguna, Tenerife, Spain.