[1] Marino R, Misra M. Extra-Skeletal Effects of Vitamin D. Nutrients, 2019; 27: 11(7).
[2] Li YC. Molecular mechanism of vitamin D in the cardiovascular system. Investig Med, 2011; 59(6):868-871.
[3] Zerofsky M, Ryder M, Bhatia S, Stephensen CB, King J, Fung EB. Effects of early vitamin D deficiency rickets on bone and dental health, growth and immunity. Matern Child Nutr, 2016; 12(4): 898-907.
[4] Zhang HQ, Teng JH, Li Y, Li XX, He YH, He X, Sun CH. Vitamin D status and its association with adiposity and oxidative stress in schoolchildren. Nutrition, 2014; 30: 1040–1044.
[5] Litonjua AA. Vitamin D deficiency as a risk factor for childhood allergic disease and asthma. Curr Opin Allergy Clin Immunol, 2012; 12: 179–185.
[6] Thornton KA, Marín C, Mora-Plazas M, Villamor E. Vitamin D deficiency associated with increased incidence of gastrointestinal and ear infections in school-age children. Pediatr Infect Dis J, 2013; 32: 585–593.
[7] Calvo MS, Whiting SJ, Barton CN. Vitamin D intake: a global perspective of current status. J Nutr, 2005; 135: 310–316.
[8] Holick MF. Sunlight, UV-radiation,. vitamin D and skin cancer: how much sunlight do we need? Adv Exp Med Biol, 2008; 624: 1–15.
[9] Zhao X, Xiao J, Liao X, Cai L, Xu F, Chen D, Xiang J, Fang R. Vitamin D Status among Young Children Aged 1-3 Years: A Cross-Sectional Study in Wuxi, China. PLoS One. 2015; 10(10):e0141595.
[10] Mansbach JM, Ginde AA, Camargo CA Jr. Serum 25-hydroxyvitamin D levels among US children aged 1 to 11 years: do children need more vitamin D. Pediatrics, 2009;124: 1404-1410.
[11] Zhu Z, Zhan J, Shao J, Chen W, Chen L, Li W, Ji C, Zhao Z. High prevalence of vitamin D deficiency among children aged 1 month to 16 years in Hangzhou, China. BMC Public Health, 2012; 12: 126.
[12] Quah SW, Abdul Majid H, Al-Sadat N, Yahya A, Su TT, Jalaludin MY. Risk factors of vitamin D deficiency among 15-year-old adolescents participating in the Malaysian Health and Adolescents Longitudinal Research Team Study (MyHeARTs). PLoS One, 2018; 13(7):e0200736.
[13] Al-Musharaf S, Fouda MA, Turkestani IZ, Al-Ajlan A, Sabico S, Alnaami AM, Wani K, Hussain SD, Alraqebah B, Al-Serehi A, Alshingetti NM, Al-Daghri N, McTernan PG, Wimalawansa SJ, Saravanan P. Vitamin D Deficiency Prevalence and Predictors in Early Pregnancy among Arab Women. Nutrients, 2018; 10(4).
[14] Liu X, Baylin A, Levy PD. Vitamin D deficiency and insufficiency among US adults: prevalence, predictors and clinical implications. Br J Nutr, 2018; 8, 928- 936.
[15] Kubota T, Nakayama H, Kitaoka T, Nakamura Y, Fukumoto S, Fujiwara I, Hasegawa Y, Ihara K, Kitanaka S, Koyama S, Kusuda S, Mizuno H, Nagasaki K, Oba K, Sakamoto Y, Takubo N, Shimizu T, Tanahashi Y, Hasegawa K, Tsukahara H, Yorifuji T, Michigami T, Ozono K. Incidence rate and characteristics of symptomatic vitamin D deficiency in children: a nationwide survey in Japan. Endocr J. 2018; 65(6):593-599.
[16] Wagner CL, Greer FR. Prevention of rickets and vitamin D deficiency in infants, children, and adolescents. Pediatrics, 2008; 122:1142-1152.
[17] Gu Y, Zhu Z, Luan X, He J. Vitamin D status and its association with season, depression in stroke. Neurosci Lett, 2019; 690:99-105.
[18] Gu Y, Luan X, Ren W, Zhu L, He J. Impact of seasons on stroke-related depression, mediated by vitamin D status. BMC Psychiatry, 2018; 18(1):359.
[19] Hansen L, Tjønneland A, Køster B, Brot C, Andersen R, Cohen AS, Frederiksen K, Olsen A.Vitamin D Status and Seasonal Variation among Danish Children and Adults: A Descriptive Study. Nutrients, 2018; 20, 10(11).
[20] Editorial Committee of Zhonghua Er Ke Za Zhi, Child Health Group of Chinese Academy of Pediatrics, National Scientific Group of Prevention and Cure of Rickets. Recommendation for prevention and treatment of rickets of vitamin D deficiency in childhood. Zhonghua Er Ke Za Zhi, 2008, 46:190-191, (in Chinese).
[21] Voortman T, van den Hooven EH, Heijboer AC, Hofman A, Jaddoe VW, Franco OH. Vitamin D deficiency in school-age children is associated with sociodemographic and lifestyle factors. J Nutr, 2015; 145:791–798.
[22] Yao Y, Fu S, Li N, Hu F, Zhang H, Zhu Q, Luan F, Zhang F, Zhao Y, He Y. Sex, Residence and Fish Intake Predict Vitamin D Status in Chinese Centenarians.J Nutr Health Aging. 2019; 23(2):165-171.
[23] Ten Haaf DSM, Balvers MGJ, Timmers S, Eijsvogels TMH, Hopman MTE, Klein Gunnewiek JMT. Determinants of vitamin D status in physically active elderly in the Netherlands. Eur J Nutr. 2018; 6.
[24] Holick MF. Vitamin D deficiency. N Engl J Med, 2007; 357:266-281.
[25] Marwaha RK, Sreenivas V, Talwar D, Yenamandra VK, Challa A, Lakshmy R, Sharma VK, Sethuraman G. Impact of solar ultraviolet B radiation (290-320 nm) on vitamin D synthesis in children with type IV and V skin. Br J Dermatol. 2015;173(2):604-606.
[26] Greenfield JA, Park PS, Farahani E, Malik S, Vieth R, McFarlane NA, Shepherd TG, Knight JA. Solar ultraviolet-B radiation and vitamin D: a cross-sectional population-based study using data from the 2007 to 2009 Canadian Health Measures Survey. BMC Public Health. 2012; 12:660.