1. Department of Internal Medicine, High Specialty Medical Unit, Specialty Hospital, Dr. Antonio Fraga Mouret, La Raza National Medical Center, México City, Mexico
2. Department of Pathological Anatomy, High Specialty Medical Unit, Specialty Hospital, Dr. Antonio Fraga Mouret, La Raza National Medical Center, México City, Mexico
3. Department of Internal Medicine, Hospital General Regional N° 251, Metepec, Mexico