[1] HC CMN SXXI, IMSS, UIMEM, Lab Res Traslac, Mexico City, DF, Mexico
[2] Hosp Gen Zona 25, IMSS, Monterrey, NL, Mexico
[3] CMO, IMSS, Guadalajara, Jalisco, Mexico
[4] Opcion Oncolog, Monterrey, Mexico
[5] Torre Med Sur, Mexico City, DF, Mexico
[6] Hosp Reg, ISSSTE, Zacatecas, Zacatecas, Mexico
[7] CMN 20 Noviembre, Mexico City, DF, Mexico