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Progress on vitamin A for newborn respiratory distress. Int J Pediatr 2011;38(5):461 \u2212 4. http:\/\/dx.doi.org\/10.3760\/cma.j.issn.1673-4408.2011.05.012.  (In Chinese)."},{"key":"2","unstructured":"Tang YY, Tan AB, Shi WY. Serum vitamin A level in children with recurrent respiratory tract infections or intrinsic asthma. Pract Clin Med 2015;16(1):72 \u2212 4. http:\/\/dx.doi.org\/10.13764\/j.cnki.lcsy.2015.01.031.  (In Chinese)."},{"key":"3","unstructured":"WHO. Global prevalence of vitamin A deficiency in populations at risk 1995\u20132005: WHO global database on Vitamin A deficiency. Geneva (Switzerland): World Health Organization; 2009. <a href=\"https:\/\/apps.who.int\/iris\/bitstream\/handle\/10665\/44110\/9789241598019_eng.pdf\" target=\"_blank\">https:\/\/apps.who.int\/iris\/bitstream\/handle\/10665\/44110\/9789241598019_eng.pdf<\/a>. [2021-01-18]."},{"key":"4","doi-asserted-by":"crossref","unstructured":"Sherwin JC, Reacher MH, Dean WH, Ngondi J. Epidemiology of vitamin A deficiency and xerophthalmia in at-risk populations. Trans R Soc Trop Med Hyg 2012;106(4):205 \u2212 14. http:\/\/dx.doi.org\/10.1016\/j.trstmh.2012.01.004.","DOI":"10.1016\/j.trstmh.2012.01.004"},{"key":"5","unstructured":"National Health and Family Planning Commission of PRC. WS\/T 553-2017 Method for vitamin A deficiency screening. Beijing: Standards Press of China, 2018. <a href=\"http:\/\/www.nhc.gov.cn\/ewebeditor\/uploadfile\/2017\/08\/20170811093617394.pdf\" target=\"_blank\">http:\/\/www.nhc.gov.cn\/ewebeditor\/uploadfile\/2017\/08\/20170811093617394.pdf<\/a>. (In Chinese)."},{"key":"6","doi-asserted-by":"crossref","unstructured":"Yu DM, Zhao LY, Zhang J, Yang ZY, Yang LC, Huang J, et al. China Nutrition and Health Surveys (1982\u22122017). China CDC Wkly 2021;3(9):193 \u2212 195. http:\/\/dx.doi.org\/10.46234\/ccdcw2021.058.","DOI":"10.46234\/ccdcw2021.058"},{"key":"7","unstructured":"Zhang Q, Hu XQ. Report on nutrition and health surveillance (2010\u20132012)- nutrition and health status of school age children aged 6-17 in China. People\u2019s Medical Publishing House; 2018. (In Chinese)."},{"key":"8","doi-asserted-by":"crossref","unstructured":"Vuralli D, Tumer L, Hasanoglu A, Biberoglu G, Pasaoglu H. Vitamin A status and factors associated in healthy school-age children. Clin Nutr 2014;33(3):509 \u2212 12. http:\/\/dx.doi.org\/10.1016\/j.clnu.2013.07.008.","DOI":"10.1016\/j.clnu.2013.07.008"},{"key":"9","doi-asserted-by":"crossref","unstructured":"Breidenassel C, Valtue\u00f1a J, Gonz\u00e1lez-Gross M, Benser J, Spinneker A, Moreno LA, et al. Antioxidant vitamin status (A, E, C, and beta-carotene) in European adolescents - the HELENA study. Int J Vitam Nutr Res 2011;81(4):245 \u2212 55. http:\/\/dx.doi.org\/10.1024\/0300-9831\/a000070.","DOI":"10.1024\/0300-9831\/a000070"},{"key":"10","doi-asserted-by":"crossref","unstructured":"Custodio VIC, Daneluzzi JC, Custodio RJ, Del Ciampo LA, Ferraz IS, Martinelli Jr CE, et al. Vitamin A deficiency among Brazilian school-aged children in a healthy child service. Eur J Clin Nutr 2009;63(4):485 \u2212 90. http:\/\/dx.doi.org\/10.1038\/sj.ejcn.1602962.","DOI":"10.1038\/sj.ejcn.1602962"},{"key":"11","unstructured":"Yu DM, Zhang B, Zhao LY, Wang HJ, He YN, Liu AD, et al. Snacks consumption in Chinese children and adolescents at the ages of 3-17 years. J Hyg Res 2008;37(6):710 \u2212 3. http:\/\/dx.doi.org\/10.3969\/j.issn.1000-8020.2008.06.021.  (In Chinese)."},{"key":"12","doi-asserted-by":"crossref","unstructured":"Yang C, Chen J, Guo N, Liu Z, Yun CF, Li YJ, et al. Comparison on the status of vitamin A in 6- to 13- year-old children between 2002 and 2012 in China. 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