1. Department of Internal Medicine Hospital Virgen del Puerto Plasencia Spain
2. Department of Internal Medicine Hospital General Universitario Santa Lucía Cartagena Spain
3. Autoimmune Diseases Research Unit, Department of Internal Medicine, Biocruces Bizkaia Health Research Institute Hospital Universitario Cruces Barakaldo Spain
4. University of the Basque Country Faculty of Medicine and Nursing, Medicine Barakaldo Spain
5. University of the Basque Country, UPV/EHU Bilbao Spain