1. Pediatric Endocrinology Department, Hospital de Pediatría , UMAE CMN Siglo XXI , Mexico City , Mexico
2. Pediatric Department , Hospital General de Zona No. 32 , Querétaro , Mexico
3. Pediatric Department , Hospital General Regional No. 2 , Querétaro , Mexico
4. Pediatric Department , Hospital General de Subzona y Medicina Familiar No. 4 , Tecomán Colima , Mexico
5. Pediatric Department , Hospital de Ginecopediatria , Hermosillo , Sonora , Mexico
6. Pediatric Department , Hospital General de Zona No. 197 , Texcoco Estado de México , Mexico
7. Pediatric Endocrinology Department , Hospital Municipal del Niño. Hospital Materno-Infantil SSA , Durango , Mexico
8. Pathology Department, Hospital de Pediatría , UMAE CMN Siglo XXI , Mexico City , Mexico
9. Master of Science, Endocrinology Department, Hospital de Especialidades , UMAE CMN Siglo XXI , IMSS, Avenida Cuauhtémoc N. 330 Colonia Doctores. C.P. 06720 , Mexico City , Mexico