1. Hematology Laboratory, Regional Research Center, Autonomous University of Yucatan, Yucatan, Mexico
2. Genetic Laboratory, Regional Research Center, Autonomous University of Yucatan, Yucatan, Mexico
3. Rheumatology Department, Agustin O’Horan General Hospital, Yucatan, Mexico
4. Rheumatology Department, Regional Hospital General (ISSSTE), Health Service Yucatan, Yucatan, Mexico