1. Research Division, Hospital Juárez de México, Mexico City, Mexico
2. Genetic Laboratory, Hospital Nacional Homeopático, Mexico City, Mexico
3. Department of Genetics and Molecular Biology, Centro de Investigación y de Estudios Avanzados, Ciudad de Mexico, Mexico
4. Research Unit, Hospital Regional de Alta Especialidad de Ixtapaluca, IMSS-BINESTAR, Ixtapaluca, Mexico