1. Systemic Autoimmune Diseases Unit, Department of Internal Medicine, Hospital Universitario Ramón y Cajal, IRYCIS, 28034 Madrid, Spain
2. Department of Dermatology, Hospital Universitario Ramón y Cajal, IRYCIS, 28034 Madrid, Spain
3. Faculty of Medicine and Health Sciences, Universidad de Alcalá (UAH), 28801 Alcalá de Henares, Spain