[1] Hosp Gen Cuernavaca Dr Jose G Parres, Cuernavaca, Morelos, Mexico
[2] Hosp Nino DIF, Pachuca, Hidalgo, Mexico
[3] Hosp Alta Especialidad Nino Dr Rodolfo Nieto Padr, Villahermosa, Tabasco, Mexico
[4] IMSS Torreon, Unidad Med Alta Especialidad HE 71, Torreon, Coahuila, Mexico
[5] Hosp Reg, Delicias, Chihuahua, Mexico
[6] Fac Med Minatitlan, Minatitlan, Veracruz, Mexico
[7] Inst Nacl Neurol & Neurocirugia Dr Manuel Velasco, PPE, Mexico City, DF, Mexico
[8] Hosp Psiquiatr Infantil Dr Juan N Navarro, Mexico City, DF, Mexico
[9] Hosp Cent Dr Ignacio Morones Prieto, San Luis Potosi, San Luis Potosi, Mexico