Evaluation of nutrition surveillance indicators.
D000886:Anthropometry; D002664:Child Nutritional Physiological Phenomena; D002675:Child, Preschool; D003967:Diarrhea / Q000453:epidemiology*; D004544:El Salvador; D006801:Humans; D007223:Infant; D008137:Longitudinal Studies; D009748:Nutrition Disorders / Q000453:epidemiology*; D009749:Nutrition Surveys; D012621:Seasons