Gonzalez-Ceron, Lilia
Rodriguez, Mario H.
Sandoval, Marco A.
Santillan, Frida
Galindo-Virgen, Sonia
Betanzos, Angel F.
Rosales, Angel F.
Palomeque, Olga L.
Funding for this research was provided by:
Pan-American Health Organization (MEX/07/005015)
National Institute for Public Health-Mexico (CI-624)