1. Internal Medicine Department, Hospital de Especialidades Centro Médico Nacional “La Raza”, Instituto Mexicano del Seguro Social, Mexico City, Mexico
2. Division of Postgraduate Studies, Universidad Nacional Autónoma de México, Mexico City, Mexico
3. Patology Department, Hospital de Especialidades Centro Médico Nacional “La Raza”, Instituto Mexicano del Seguro Social, Mexico City, Mexico
4. Hematology Department, Hospital de Especialidades Centro Médico Nacional “La Raza”, Instituto Mexicano del Seguro Social, Mexico City, Mexico