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Yang, Chun, Jing Chen, Ning Guo, Zhen Liu, Chunfeng Yun, Yajie Li, Jianhua Piao, och Xiaoguang Yang. "Comparison On the Status of Vitamin A in 6- to 13- Year-old Children between 2002 and 2012 in China." Nutr J 2016.

Yang, Chun, et al. "Comparison On the Status of Vitamin A in 6- to 13- Year-old Children between 2002 and 2012 in China." Nutr J 2016.