From the Arthritis Unit
Rheumatology Department, Institut Cl[iacute]nic de l[apos ]Aparell Locomotor (ICAL), Hospital Cl[iacute]nic de Barcelona, and Institut d[apos ]Investigacions Biom[eacute]diques Agust[iacute] P[iacute] i Su[ntilde]er (IDIBAPS), Universitat de Barcelona, Barcelona, Spain.