8STAPHENSEN C B. Vitamin A Infection and immune function [J]. Annv Rev Nutr, 2001, 21:167-192.
9SWAMI H M, THAKUR J S, BHATIA S P. Impact of mass sup- plementation of vitamin A [ J ]. Indian J Pediatr, 2007, 74 ( 5 ) : 443 - 447.
10MCGOWAN S E, SMITH J, HOLMES A J, et al. Vitamin A defi- ciency promotes bronchial hyperreactivity in rats by altering musca- rinic M2 receptor function[ J]. Am J Physiol Lung Cell Mol Physi- ol, 2002, 282(5): L1031 -L1039.