… -blind, randomized, clinical trial of the effect of vitamin A and zinc supplementation on diarrheal disease and respiratory tract infections in children in Mexico City …
… children 6–15 mo of age were assigned to 1 of 4 groups: 1) a vitamin A group that received 20 000 IU retinol every 2 mo for children aged ≤1 y or 45 000 IU for children aged >1 y, 2) a …..... Read More