1. Systemic Autoimmune Diseases Unit, Department of Medicine, IDIBAPS, Hospital Clínic, Universitat de Barcelona, Barcelona, Catalonia, Spain
2. Rheumatic Disease Unit, School of Medicine, Universidad Autónoma de Puebla, Puebla, México
3. Systemic Autoimmune Diseases Unit, Department of Medicine, IDIBAPS, Hospital Clónic, Universitat de Barcelona, Barcelona, Catalonia, Spain
4. Department of Internal Medicine, Hospital Son Dureta, Mallorca, Spain