[1] Minist Hlth SSA, Gastroenterol & Nutr Dept, Hosp Infantil Mexico Federico Gomez, Mexico City, DF, Mexico
[2] Minist Hlth SSA, Epidemiol Res Unit Endocrinol & Nutr, Hosp Infantil Mexico Federico Gomez, Dr Marquez 162, Mexico City 06720, DF, Mexico
[3] Univ Nacl Autonoma Mexico, Med Fac, Mexico City, DF, Mexico
[4] Minist Hlth SSA, Hosp Infantil Mexico Federico Gomez, Res, Mexico City, DF, Mexico
[5] Latin Amer Soc Pediat Gastroenterol Hepatol & Nut, Res Comm, Mexico City, DF, Mexico