1. Pediatric Endocrinology Department, Hospital de Pediatría, UMAE CMN Siglo XXI, IMSS, Mexico City, Mexico
2. Pediatric Department, UMAE IMSS Mérida, Mérida, Yucatán, Mexico
3. Nutrition Research Unit, Hospital de Pediatría, UMAE CMN Siglo XXI, IMSS, Mexico City, Mexico
4. Endocrinology Department, Hospital de Especialidades, UMAE CMN Siglo XXI, IMSS, Mexico City, Mexico