1. Systemic Autoimmune Diseases Unit, Vall d’Hebron General Hospital, Universitat Autonoma de Barcelona, Barcelona, Spain
2. National Institutes of Health, Muscle Diseases, NIAMS, Bethesda, MD, USA
3. Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
4. Rheumatology Unit, Vall d’Hebron General Hospital, Universitat Autonoma de Barcelona, Barcelona, Spain
5. Internal Medicine Department, Hospital Clinic, Universitat de Barcelona, CIBERER, Barcelona, Spain
6. Immunology Department, Hospital de la Santa Creu i Sant Pau, Universitat Autonoma de Barcelona, Barcelona, Spain
7. Immunology Department, Vall d’Hebron General Hospital, Universitat Autonoma de Barcelona, Barcelona, Spain