1. Department of Pediatrics, Pediatrics and Gynecology Hospital 3-A of the Mexican Institute of Social Security (IMSS), Mexico City, Mexico
2. Department of Pediatrics, Gyneco-Pediatrics Hospital of the Mexican Institute Social Security (IMSS) Veracruz, Mexico
3. Department of Pediatrics and Rheumatology, Hospital General Medical Center "La Raza" of the Mexican Institute of Social Security (IMSS), Mexico City, Mexico
4. AIDS Clinic at the Infectology Hospital of the National Medical Center "La Raza" of the Mexican Institute of Social Security (IMSS), Mexico City, Mexico