[1] Hosp Civil Guadalajara Dr Juan I Menchaca, Div Pediat, Guadalajara, Jalisco, Mexico
[2] Univ Guadalajara, Ctr Univ Tonala, Tonala, Jalisco, Mexico
[3] Hosp Civil Guadalajara Dr Juan I Menchaca, Dept Epidemiol, Guadalajara, Jalisco, Mexico
[4] Univ Guadalajara, Ctr Univ Ciencias Salud, Guadalajara, Jalisco, Mexico