1. Research Unit in Analysis and Synthesis of the Evidence National Medical Center XXI Century Instituto Mexicano del Seguro Social Mexico City Mexico
2. Facultad de Medicina Universidad Nacional Autónoma de Mexico Hospital Infantil de Mexico Federico Gómez Mexico City Mexico
3. Unit of Research in Medical Nutrition National Medical Center XXI Century Instituto Mexicano del Seguro Social Mexico City Mexico
4. Adolescent Medicine Service Hospital Infantil de Mexico Federico Gómez Ministry of Health (SSA) Mexico City Mexico
5. Department of Pediatric Nephology Children’s Hospital National Medical Center XXI Century Instituto Mexicano del Seguro Social Mexico City Mexico
6. Endocrine Research Unit Centro Médico Nacional Instituto Mexicano del Seguro Social Mexico City Mexico