1. Feldman D, Malloy PJ, Krishnan AV, Balint E. Marcus R, Feldman D, Nelson DA, Rosen CJ, editors. Vitamin D: biology, action and clinical implications. 2007. 3rd edition. San Diego (CA): Academic Press;317–382.
2. Holick MF. Holick MF, editor. Evolution, biologic functions, and recommended dietary allowance for vitamin D. Vitamin D: physiology, molecular biology and clinical applications. 1999. Totowa (NJ): Humana Press;1–16.
3. Weick MT. A history of rickets in the United States. Am J Clin Nutr. 1967. 20:1234–1241.
Article
4. Lovinger RD. Grand round series. Rickets. Pediatrics. 1980. 66:359–365.
5. Holick MF. Vitamin D deficiency. N Engl J Med. 2007. 357:266–281.
Article
6. Chapuy MC, Schott AM, Garnero P, Hans D, Delmas PD, Meunier PJ. EPIDOS Study Group. Healthy elderly French women living at home have secondary hyperparathyroidism and high bone turnover in winter. J Clin Endocrinol Metab. 1996. 81:1129–1133.
Article
7. Marwaha RK, Tandon N, Reddy DR, Aggarwal R, Singh R, Sawhney RC, et al. Vitamin D and bone mineral density status of healthy schoolchildren in northern India. Am J Clin Nutr. 2005. 82:477–482.
Article
8. Thacher TD, Fischer PR, Strand MA, Pettifor JM. Nutritional rickets around the world: causes and future directions. Ann Trop Paediatr. 2006. 26:1–16.
Article
9. Misra M, Pacaud D, Petryk A, Collett-Solberg PF, Kappy M. Drug and Therapeutics Committee of the Lawson Wilkins Pediatric Endocrine Society. Vitamin D deficiency in children and its management: review of current knowledge and recommendations. Pediatrics. 2008. 122:398–417.
Article
10. Norman AW. From vitamin D to hormone D: fundamentals of the vitamin D endocrine system essential for good health. Am J Clin Nutr. 2008. 88:491S–499S.
Article
11. Holick MF, Binkley NC, Bischoff-Ferrari HA, Gordon CM, Hanley DA, Heaney RP, et al. Endocrine Society. Evaluation, treatment, and prevention of vitamin D deficiency: an Endocrine Society clinical practice guideline. J Clin Endocrinol Metab. 2011. 96:1911–1930.
Article
12. Choi HS, Oh HJ, Choi H, Choi WH, Kim JG, Kim KM, et al. Vitamin D insufficiency in Korea--a greater threat to younger generation: the Korea National Health and Nutrition Examination Survey (KNHANES) 2008. J Clin Endocrinol Metab. 2011. 96:643–651.
Article
13. Shin YH, Kim KE, Lee C, Shin HJ, Kang MS, Lee HR, et al. High prevalence of vitamin D insufficiency or deficiency in young adolescents in Korea. Eur J Pediatr. 2012. [Epub ahead of print].
Article
14. Lee M, Larson R. The Korean 'examination hell': long hours of studying, distress, and depression. J Youth Adolesc. 2000. 29:249–271.
Article
15. Sullivan S, Rosen C, Chen T, Holick M. Seasonal changes in serum 25(OH)D in adolescent girls in Maine. Proceedings ofthe American Society for Bone and Mineral Research Annual Meeting. 2003. Washington, DC: American Society for Bone and Mineral Research;S407.
16. Holick MF, Chen TC. Vitamin D deficiency: a worldwide problem with health consequences. Am J Clin Nutr. 2008. 87:1080S–1086S.
Article
17. Ziegler EE, Hollis BW, Nelson SE, Jeter JM. Vitamin D deficiency in breastfed infants in Iowa. Pediatrics. 2006. 118:603–610.
Article
18. Yoon JW, Kim SW, Yoo EG, Kim MK. Prevalence and risk factors for vitamin D deficiency in children with iron deficiency anemia. Korean J Pediatr. 2012. 55:206–211.
Article
19. Kim JS, Choi JY, Lee KW, Song IJ, Kim CA, Son BH, et al. The study in vitamin d concentration in the blood for infants with high level of alkaline phosphatase. Kosin Med J. 2012. 27:17–24.
Article
20. Karohl C, Su S, Kumari M, Tangpricha V, Veledar E, Vaccarino V, et al. Heritability and seasonal variability of vitamin D concentrations in male twins. Am J Clin Nutr. 2010. 92:1393–1398.
Article
21. Arguelles LM, Langman CB, Ariza AJ, Ali FN, Dilley K, Price H, et al. Heritability and environmental factors affecting vitamin D status in rural Chinese adolescent twins. J Clin Endocrinol Metab. 2009. 94:3273–3281.
Article
22. Snellman G, Melhus H, Gedeborg R, Olofsson S, Wolk A, Pedersen NL, et al. Seasonal genetic influence on serum 25-hydroxyvitamin D levels: a twin study. PLoS One. 2009. 4:e7747.
Article
23. Feldman D, Pike JW, Glorieux FH, editors. Vitamin D. 2005. San Diego (CA): Elsevier Academic Press.
24. Buyukinan M, Ozen S, Kokkun S, Saz EU. The relation of vitamin D deficiency with puberty and insulin resistance in obese children and adolescents. J Pediatr Endocrinol Metab. 2012. 25:83–87.
Article
25. Delvin EE, Lambert M, Levy E, O'Loughlin J, Mark S, Gray-Donald K, et al. Vitamin D status is modestly associated with glycemia and indicators of lipid metabolism in French-Canadian children and adolescents. J Nutr. 2010. 140:987–991.
Article
26. Maestro B, Campión J, Dávila N, Calle C. Stimulation by 1,25-dihydroxyvitamin D3 of insulin receptor expression and insulin responsiveness for glucose transport in U-937 human promonocytic cells. Endocr J. 2000. 47:383–391.
Article
27. Hyppönen E, Läärä E, Reunanen A, Järvelin MR, Virtanen SM. Intake of vitamin D and risk of type 1 diabetes: a birth-cohort study. Lancet. 2001. 358:1500–1503.
Article
28. Suneetha PV, Sarin SK, Goyal A, Kumar GT, Shukla DK, Hissar S. Association between vitamin D receptor, CCR5, TNF-alpha and TNF-beta gene polymorphisms and HBV infection and severity of liver disease. J Hepatol. 2006. 44:856–863.
Article
29. Huang YW, Liao YT, Chen W, Chen CL, Hu JT, Liu CJ, et al. Vitamin D receptor gene polymorphisms and distinct clinical phenotypes of hepatitis B carriers in Taiwan. Genes Immun. 2010. 11:87–93.
Article
30. Arababadi MK, Pourfathollah AA, Jafarzadeh A, Hassanshahi G, Rezvani ME. Association of exon 9 but not intron 8 VDR polymorphisms with occult HBV infection in south-eastern Iranian patients. J Gastroenterol Hepatol. 2010. 25:90–93.
Article
31. Chatzidaki V, Choumerianou D, Dimitriou H, Kouroumalis E, Galanakis E. Genetic variants associated with susceptibility to mother-to-child transmission of hepatitis B virus. Eur J Gastroenterol Hepatol. 2012. 24:1185–1190.
Article
32. Bitetto D, Fabris C, Fornasiere E, Pipan C, Fumolo E, Cussigh A, et al. Vitamin D supplementation improves response to antiviral treatment for recurrent hepatitis C. Transpl Int. 2011. 24:43–50.
Article
33. Petta S, Cammà C, Scazzone C, Tripodo C, Di Marco V, Bono A, et al. Low vitamin D serum level is related to severe fibrosis and low responsiveness to interferon-based therapy in genotype 1 chronic hepatitis C. Hepatology. 2010. 51:1158–1167.
Article
34. Cholongitas E, Theocharidou E, Goulis J, Tsochatzis E, Akriviadis E, Burroughs K. Review article: the extra-skeletal effects of vitamin D in chronic hepatitis C infection. Aliment Pharmacol Ther. 2012. 35:634–646.
Article
35. Bitetto D, Fabris C, Falleti E, Fornasiere E, Fumolo E, Fontanini E, et al. Vitamin D and the risk of acute allograft rejection following human liver transplantation. Liver Int. 2010. 30:417–444.
Article
36. Podolsky DK. Inflammatory bowel disease. N Engl J Med. 1991. 325:928–937.
Article
37. Sonnenberg A, McCarty DJ, Jacobsen SJ. Geographic variation of inflammatory bowel disease within the United States. Gastroenterology. 1991. 100:143–149.
Article
38. Kong J, Zhang Z, Musch MW, Ning G, Sun J, Hart J, et al. Novel role of the vitamin D receptor in maintaining the integrity of the intestinal mucosal barrier. Am J Physiol Gastrointest Liver Physiol. 2008. 294:G208–G216.
Article
39. Simmons JD, Mullighan C, Welsh KI, Jewell DP. Vitamin D receptor gene polymorphism: association with Crohn's disease susceptibility. Gut. 2000. 47:211–214.
Article
40. Cantorna MT, Munsick C, Bemiss C, Mahon BD. 1,25-Dihydroxycholecalciferol prevents and ameliorates symptoms of experimental murine inflammatory bowel disease. J Nutr. 2000. 130:2648–2652.
Article
41. Alkhouri RH, Hashmi H, Baker RD, Gelfond D, Baker SS. Vitamin and mineral status in patients with inflammatory bowel disease. J Pediatr Gastroenterol Nutr. 2012. [Epub ahead of print].
Article
42. Pappa HM, Gordon CM, Saslowsky TM, Zholudev A, Horr B, Shih MC, et al. Vitamin D status in children and young adults with inflammatory bowel disease. Pediatrics. 2006. 118:1950–1961.
Article
43. Sentongo TA, Semaeo EJ, Stettler N, Piccoli DA, Stallings VA, Zemel BS. Vitamin D status in children, adolescents, and young adults with Crohn disease. Am J Clin Nutr. 2002. 76:1077–1081.
Article
44. Gokhale R, Favus MJ, Karrison T, Sutton MM, Rich B, Kirschner BS. Bone mineral density assessment in children with inflammatory bowel disease. Gastroenterology. 1998. 114:902–911.
Article
45. Issenman RM, Atkinson SA, Radoja C, Fraher L. Longitudinal assessment of growth, mineral metabolism, and bone mass in pediatric Crohn's disease. J Pediatr Gastroenterol Nutr. 1993. 17:401–406.
Article
46. Gartner LM, Greer FR. Section on Breastfeeding and Committee on Nutrition. American Academy of Pediatrics. Prevention of rickets and vitamin D deficiency: new guidelines for vitamin D intake. Pediatrics. 2003. 111:908–910.
Article
47. Wagner CL, Greer FR. American Academy of Pediatrics Section on Breastfeeding. American Academy of Pediatrics Committee on Nutrition. Prevention of rickets and vitamin D deficiency in infants, children, and adolescents. Pediatrics. 2008. 122:1142–1152.
Article
48. Institute of Medicine (US). Ross AC, Taylor CL, Yaktine AL, Valle HBD, editors. Committee to review dietary reference intakes for vitamin D and calcium. 2011. Washington, DC: National Academies Press.
50. Matsuoka LY, Ide L, Wortsman J, MacLaughlin JA, Holick MF. Sunscreens suppress cutaneous vitamin D3 synthesis. J Clin Endocrinol Metab. 1987. 64:1165–1168.