1. Systemic Autoimmune Diseases Research Unit, HGR 36, Instituto Mexicano del Seguro Social, Puebla, Mexico, , Department of Rheumatology and Immunology, Benemórita Universidad Autónoma de Puebla, Puebla, Mexico
2. Systemic Autoimmune Diseases Research Unit, HGR 36, Instituto Mexicano del Seguro Social, Puebla, Mexico
3. Direction of Education and Reserch HGR 36, CMN Manuel Avila Camacho, Instituto Mexicano del Seguro Social, Puebla, Mexico
4. State Research Departament, Instituto Mexicano del Seguro Social, Puebla, Mexico