1. Division of Pediatric Gastroenterology, Hepatology and Nutrition, Hospital General de Puebla Dr Eduardo Vázquez N, Puebla, Mexico
2. Department of Genetics, Hospital de la Mujer, Puebla, Mexico
3. Division of Pediatric Surgery, Hospital General de Puebla Dr Eduardo Vázquez N, Puebla, Mexico
4. School of Medicine, Benemérita Universidad Autónoma de Puebla, Puebla, Mexico.