1. Instituto Nacional de Ciencias Medicas y Nutrición Salvador Zubirán; Clinical Nutrition; Vasco de Quiroga 15, Sección XVI, Tlalpan Mexico City Distrito Federal Mexico 14000
2. Instituto Nacional de Pediatría; Methodology Research Unit; Insurgentes Sur 3700 - C Col. Insurgentes Cuicuilco, Coyoacan Mexico City Distrito Federal Mexico 04530
3. University of Michigan School of Public Health; Nutritional Sciences; Ann Arbor USA 48109
4. Hospital General de Mexico Dr. Eduardo Liceaga; Research Projects registration and follow up; Dr. Balmis 148, Col. Doctores, Delegacion Cuauhtemoc Mexico City Distrito Federal Mexico 06726