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Vitamin A supplementation (VAS) at birth was not associated with improved survival in a randomised, placebo-controlled trial in Guinea-Bissau. However, a negative sex-differential effect, which(More)
It’s not clear what ‘indicator variables’ are: rephrasing for clarity would be useful. NDS response to reviewer: These ‘indicator’ or proxy variables for biochemical measurement of VAD are mentioned(More)
BACKGROUND The effect of oral polio vaccine administered already at birth (OPV0) on child survival was not examined before being recommended in 1985. Observational data suggested that OPV0 was(More)