by Estrada, María, Sánchez Tovar, Ligia, Gómez, Wuilman
Published: Instituto de Altos Estudios en Salud Pública "Dr. Arnaldo Gabaldón" 2006

by Noriega Elío, Mariano
Published: 1995

by Guevara, Harold, Rojas, Maritza, Squiílante, Guido, Medina, Xiomara
Published: 1998