1. Internal Medicine Department, Vall d’Hebron University Hospital, Barcelona, Spain
2. Medicine Department, Universitat Autónoma de Barcelona, Barcelona, Spain
3. NIAMS, National Institutes of Health, Muscle Diseases Unit, Bethesda, MD, USA
4. Pathology Department, Vall d’Hebron University Hospital, Barcelona, Spain
5. Immunology Department, Hospital de la Santa Creu I Sant Pau, Barcelona, Spain
6. Muscle Research Group and Ciberer, Hospital Clinic Provincial, Institut d’Investigacions Biomédiques August Pi I Sunyer, Universitat de Barcelona, Barcelona, Spain
7. Dermatology Department, Vall d’Hebron University Hospital, Barcelona, Spain