1Regional Programme of Information Systems on Food and Nutrition Security (PRESISAN), San Salvador, El Salvador, E-mail: ricardo@sibrian.net
2Regional Programme of Food and Nutrition Security for Central America (PRESANCA II), San Salvador, El Salvador, E-mail: ricardo@sibrian.net
*Corresponding Author:
Ricardo Sibrián, Statistician, Regional Programme of Information Systems on Food and Nutrition Security (PRESISAN), San Salvador, El Salvador, Tel: 50250197370