Current status of vitamin A deficiency in preschool children in Dongguan, China and the effect of vitamin A on serum ferritin and red blood cell parameters
ZHANG Zhen-Hong, NI Ming, HU Yuan
CJCP . 2018, (3): 195 -199 .  DOI: 10.7499/j.issn.1008-8830.2018.03.006