1. Holick MF. High prevalence of vitamin D inadequacy and implications for health. Mayo ClinProc2006; 81(3):353-73.
2. Ross AC, Taylor CL, Yaktine AL, Del Valle HB. Dietary Reference Intakes for Calcium and Vitamin D. Washington (DC): National Academies Press (US); 2011. Available from: http://www. ncbi.nlm. nih. gov /books/NBK56070/.last access at (24/11/2014).
3. Cranney A, Horsley T, O’Donnell S, Weiler H, Puil L, Ooi D, et al. Effectiveness and safety of vitamin D in relation to bone health. Evid RepTechnol Assess (Full Rep) 2007;( 158):1–235.
4. Holick MF. Vitamin D. In: Shils ME, Shike M, Ross AC, Caballero B, Cousins RJ , (eds). Modern Nutrition in Health and Disease, 10thed. Philadelphia: Lippincott Williams & Wilkins; 2006. 378-93.
5. Norman AW, Henry HH. Vitamin D. In: Bowman BA, Russell RM, (eds). Present Knowledge in Nutrition, 9thed. Washi-ngton DC: ILSI Press; 2006. 199-214.
6. Jones G. Expanding Role for Vitamin D in chronic kidney disease: importance of blood 25-OH-D levels and extra-renal 1α- hydroxylase in the classical and non classical actions of 1α, 25- dihydroxyvi-tamin D3. Semin Dial 2007;20(4): 316-24.
7. Bikle D. Non classic actions of vitamin D. J ClinEndocrinolMetab 2009; 94(1):26–34.
8. Misra M, Pacaud D, Petryk A, Collett Solberg PF, Kappy M. Vitamin D deficiency in children and its management: review of current knowledge and recommendations. Pediatrics 2008; 122 (2):398-417.
9. Gordon CM, Feldman HA, Sinclair L, Kleinman PK, Perez-Rossello J. Prevalence of vitamin D deficiency among healthy infants and toddlers. Arch Pediatr Adolesc Med 2008; 162(6):505–12.
10. Saintonge S, Bang H, Gerber LM. Implications of a new definition of vitamin D deficiency in a multiracial us adolescent population: the National Health and Nutrition Examination Survey III. Pediatrics 2009; 123(3):797–803.
11. Gordon CM, DePeter KC, Feldman HA, Grace E, Emans SJ. Prevalence of vitamin D deficiency among healthy adolescents. Arch Pediatr Adolesc Med 2004; 158(6):531–7.
12. Ginde AA, Mansbach JM, Camargo CA Jr. Association between serum 25- hydroxyvitamin D level and upper respiratory tract infection in the third national health and nutrition examination survey. Arch Intern Med 2009; 169(4):384-90.
13. Amrein K, Zajic P, Schnedl C, Waltensdorfer A, Fruhwald S, Holl A, et al. Vitamin D status and its association with season, hospital and sepsis mortality in critical illness. Crit Care 2014; 18(2): R47.
14. McKinney JD, Bailey BA, Garrett LH, Peiris P, Manning T, Peiris AN. Relationship between vitamin D status and ICU outcomes in veterans. J Am Med DirAssoc 2011; 12(3):208-11.
15. Braun AB, Gibbons FK, Litonjua AA, Giovannucci E, Christopher KB. Low serum 25-hydroxyvitamin D at critical care initiation is associated with increased mortality. Crit Care Med 2012; 40(1):63-72.
16. McNally JD, Menon K, Chakraborty P, Fisher L, Williams KA, Al-Dirbashi OY, et al. The association of vitamin D status with pediatric critical illness. Pediatrics 2012;130:429-36.
17. Padhi R, Panda B, Jagati S, Patra SC. Vitamin D status in adult critically ill patients in Eastern India: an observational retrospective study. Lung India 2014;31:212-6.
18. Rippel C, South M, Butt WW, Shekerdemian LS. Vitamin D status in critically ill children. Intensive Care Med 2012;38:2055-62.
19. Rey C, Sánchez-Arango D, López-Herce J, Martínez-Camblor P, García-Hernández I, Prieto B, et al. Vitamin D deficiency at pediatric intensive care admission. J Pediatr (Rio J). 2014;90:135-42.
20. Madden K, Feldman HA, Smith EM, Gordon CM, Keisling SM, Sullivan RM, et al. Vitamin D deficiency in critically ill children. Pediatrics 2012;130:421-8.
21. Krika LJ. Principles of immune chemical techniques. In: Burtis CA, Ashwood ER, (eds). Tietz textbook of clinical chemistry and molecular diagnostics. 5th ed. St Louis: Elsevier Saunders Co; 2012. 219-44.
22. Meena P, Dabas A, Shah D, Malhotra RK, Madhu SV, Gupta P. Sunlight Exposure and Vitamin D Status in Breastfed Infants.Indian Pediatr 2017; 54:105-11.
23. Samuel S, Sitrin MD. Vitamin D's role in cell proliferation and differentiation. Nutr Rev. 2008 Oct;66(10):S116-24.
24. Sankar J, Lotha W, Ismail J, Anubhuti C, Meena RS, Sankar MJ, et al. Vitamin D deficiency and length of pediatric intensive care unit stay: a prospective observational study. Ann Intensive Care. 2016;6(1):3
25. Ponnarmeni S, Kumar Angurana S, Singhi S, Bansal A, Dayal D, Kaur R,et al. Vitamin D deficiency in critically ill children with sepsis. PaediatrInt Child Health 2016;36(1):15-21.
26. Shah SK, Kabra SK, Gupta N, Pai G, Lodha R. Vitamin D Deficiency and Parathyroid Response in Critically-ill Children: Association with Illness Severity and Clinical Outcomes. Indian Pediatr 2016; 53(6):479-84.