1. Fiscaletti M, Stewart P, Munns CF. The importance of vitamin D in maternal and child health: a global perspective. Public Health Rev. 2017; 38(1):1-7. doi: 10.1186/s40985-017-0066-3.
2. Nair R, Maseeh A. Vitamin D: The sunshine vitamin. J Pharmacol Pharmacother. 2012; 3(2):118-126. doi:10.4103/0976-500X.95506
3. Huh SY, Gordon CM. Vitamin D deficiency in children and adolescents: Epidemiology, impact and treatment. Rev Endocr Metab Disord. 2008; 9(2):161-170. doi: 10.1007/s11154-007-9072-y
4. World Health Organization. Nutritional Rickets: A Review of Disease Burden, Causes, Diagnosis, Prevention and Treatment. 2019; Page; 8-25, ISBN: 9789241516587.
5. Holick MF. Vitamin D deficiency. N Engl J Med. 2007; 357(3):266-81. doi: 10.1056/NEJMra070553.
6. Muscogiuri G, Altieri B, Annweiler C, Balercia G, Pal HB, Boucher BJ, Cannell JJ, Foresta C et al Vitamin D and chronic diseases: the current state of the art. Arch Toxicol. 2017; 91(1):97-107. doi: 10.1007/s00204-016-1804-x.
7. Huang SJ, Wang XH, Liu ZD, et al. Vitamin D deficiency and the risk of tuberculosis: A meta-analysis. Drug Des Devel Ther 2017; 11:91-102. doi:10.2147/DDDT.S79870.
8. Palacios C, Gonzalez L. Is Vitamin D deficiency a major global public health problem? The Journal of steroid biochemistry and molecular biology. 2014; 144:138-45. doi: 10.1016/j.jsbmb.2013.11.003
9. Zhu Z, Zhan J, Shao J, Chen W, Chen L, Li W et al. High prevalence of vitamin D deficiency among children aged 1 month to 16 years in Hangzhou, China. BMC Public Health. 2012;12(1): 1-7.doi: 10.1186/1471-2458-12-126
10. Halicioglu O, Aksit S, Koc F, Akman SA, Albudak E, Yaprak I et al. Vitamin D deficiency in pregnant women and their neonates in spring time in western Turkey. Paediatr Perinat Epidemiol. 2012;26(1):53-60.
11. O'Sullivan F, Raftery T, van Weele M, van Geffen J, McNamara D, O'Morain C et al. Sunshine is an Important Determinant of Vitamin D Status Even Among High‐dose Supplement Users: Secondary Analysis of a Randomized Controlled Trial in Crohn's Disease Patients. Photochem Photobiol. 2019; 95(4):1060-7. doi: 10.1111/php.13086.
12. Yeum KJ, Song BC, Joo NS. Impact of geographic location on vitamin D status and bone mineral density. Int J Environ Res and Public Health. 2016; 13(2):184. doi: 10.3390/ijerph13020184
13. The World Bank [Internet]. South Asia. Available from: <https://data.worldbank.org/region/south-asia> Accessed December 18, 2020.
14. Sivaramamurti, Calambur, Alexeeva, Nina Nikolaevna , Yefremov, Yury Konstantinovich et al. "South Asia". Encyclopedia Britannica, 1 Sep. 2020, <https://www.britannica.com/place/South-Asia>. Accessed 7 January 2021.
15. UNICEF [Internet] South Asia. Children in South Asia. Available from: <https://www.unicef.org/rosa/children-south-asia> Accessed November 2, 2020.
16. Prasad DS, Kabir Z, Dash AK, Das BC. Childhood cardiovascular risk factors in South Asians: A cause of concern for adult cardiovascular disease epidemic. Ann Pediatr Cardiol. 2011; 4(2):166-171. doi:10.4103/0974-2069.84663
17. Siegel KR, Patel SA, Ali MK. Non-communicable diseases in South Asia: contemporary perspectives. Br Med Bull. 2014; 111(1):31-44. doi: 10.1093/bmb/ldu018.
18. Zaidi AKM, Awasthi S, DeSilva HJ. Burden of infectious diseases in South Asia. Br Med J. 2004; 328(7443):811-815. doi:10.1136/bmj.328.7443.811
19. Jeyakumar A, Shinde V. A systematic review and meta-analysis of prevalence of vitamin D deficiency among adolescent girls in selected Indian states. Nutr Health. 2019; 25(1):61-70. doi:10.1177/0260106018805360
20. Moher D, Shamseer L, Clarke M, et al. Preferred reporting items for systematic review and meta-analysis protocols (PRISMA-P) 2015 statement. Syst Rev. 2015; 4:1. doi: https://doi.org/10.1186/2046-4053-4-1
21. Giustina A, Adler RA, Binkley N, Bouillon R, Ebeling PR, Lazaretti-Castro M, Marcocci C, Rizzoli R, Sempos CT, Bilezikian JP. Controversies in Vitamin D: Summary Statement From an International Conference. J Clin Endocrinol Metab. 2019;104(2): 234-240.doi:10.1210/jc.2018-01414
22. Ahmed F, Khosravi-Boroujeni H, Khan MR, Roy AK, Raqib R. Prevalence and Predictors of Vitamin D Deficiency and Insufficiency among Pregnant Rural Women in Bangladesh. Nutrients. 2021;13(2):449. doi: 10.3390/nu13020449.
23. Hoy D, Brooks P, Woolf A, et al. Assessing risk of bias in prevalence studies: Modification of an existing tool and evidence of interrater agreement. J Clin Epidemiol. 2012; 65(9):934-939. doi: 10.1016/j.jclinepi.2011.11.014.
24. Chowdhury MZI, Rahman M, Akter T, et al. Hypertension prevalence and its trend in Bangladesh: evidence from a systematic review and meta-analysis. Clin Hypertens. 2020; 26(1):10. doi:10.1186/s40885-020-00143-1.
25. Higgins JPT, Thompson SG, Deeks JJ, Altman DG. Measuring inconsistency in meta-analyses. Br Med J. 2003; 327(7414):557-560. doi:10.1136/bmj.327.7414.557.
26. Marwaha RK, Tandon N, Reddy DRHK, et al. Vitamin D and bone mineral density status of healthy schoolchildren in northern India. Am J Clin Nutr. 2005; 82(2):477-482. doi:10.1093/ajcn/82.2.477
27. Sahu M, Bhatia V, Aggarwal A, et al. Vitamin D deficiency in rural girls and pregnant women despite abundant sunshine in northern India. Clin Endocrinol. 2009; 70(5):680-684. doi:10.1111/j.1365-2265.2008.03360.x
28. Mandlik R, Kajale N, Ekbote V, et al. Determinants of Vitamin D status in Indian school-children. Indian J Endocrinol Metab. 2018; 22(2):244. doi: 10.4103/ijem.ijem_622_17
29. Kapil U, Pandey R, Goswami R, et al. Prevalence of Vitamin D deficiency and associated risk factors among children residing at high altitude in Shimla district, Himachal Pradesh, India. Indian J Endocrinol Metab. 2017; 21(1):178-183. doi:10.4103/2230-8210.196031
30. Basu S, Gupta R, Mitra M, Ghosh A. Prevalence of Vitamin D Deficiency in a Pediatric Hospital of Eastern India. Indian J Clin Biochem. 2015; 30(2):167-173. doi: 10.1007/s12291-014-0428-2
31. Puri S, Marwaha RK, Agarwal N, et al. Vitamin D status of apparently healthy schoolgirls from two different socioeconomic strata in Delhi: Relation to nutrition and lifestyle. Br J Nutr. 2008; 99(4):876-882. doi: 10.1017/S0007114507831758
32. Kadam NS, Chiplonkar SA, Khadilkar A V., Fischer PR, Hanumante NM, Khadilkar V V. Modifiable factors associated with low bone mineral content in underprivileged premenarchal Indian girls. J Pediatr Endocrinol Metab. 2011; 24(11-12):975-981. doi:10.1515/JPEM.2011.405.
33. Khadgawat R, Marwaha RK, Garg MK, et al. Impact of vitamin D fortified milk supplementation on vitamin D status of healthy school children aged 10-14 years. Osteoporos Int. 2013; 24(8):2335-2343. doi: 10.1007/s00198-013-2306-9
34. Chaudhuri JR, Mridula KR, Rathnakishore C, Balaraju B, Bandaru VS. Association of 25-hydroxyVitamin D deficiency in pediatric epileptic patients. Iran J Child Neurol. 2017; 11(2):48. PMID: 28698728
35. Sharawat IK, Dawman L. Bone mineral density and its correlation with Vitamin D status in healthy school-going children of Western India. Arch Osteoporos. 2019; 14(1):9-14. doi: 10.1007/s11657-019-0568-3
36. Marwaha RK, Yenamandra VK, Sreenivas V, et al. Regional and seasonal variations in ultraviolet B irradiation and Vitamin D synthesis in India. Osteoporos Int. 2016; 27(4):1611-1617. doi:10.1007/s00198-015-3427-0
37. Sarma D, Saikia UK, Baro A. Vitamin D status of school children in and around Guwahati. Indian J Endocrinol Metab. 2019 23(1): 81.doi:10.4103/ijem.IJEM_552_18
38. Sanwalka N, Khadilkar A, Chiplonkar S, Khatod K, Phadke N, Khadilkar V. Vitamin D receptor gene polymorphisms and bone mass indices in post-menarchal Indian adolescent girls. J Bone Miner Metab. 2013; 31(1):108-115. doi: 10.1007/s00774-012-0390-0
39. Mandlik R, Khadilkar A, Kajale N, Ekbote V, Patwardhan V, Mistry S, Khadilkar V, Chiplonkar S. Response of serum 25 (OH) D to Vitamin D and calcium supplementation in school-children from a semi-rural setting in India. J Steroid Biochem Mol Biol. 2018; 180:35-40. doi: 10.1016/j.jsbmb.2017.12.003
40. Borkar V V., Devidayal VS, Bhalla AK. Low levels of Vitamin D in North Indian children with newly diagnosed type 1 diabetes. Pediatr Diabetes. 2010; 11(5):345-350. doi:10.1111/j.1399-5448.2009.00589.x
41. Garg MK, Tandon N, Marwaha RK, Menon AS, Mahalle N. The relationship between serum 25-hydroxy vitamin D, parathormone and bone mineral density in Indian population. Clin Endocrino (Oxf). 2014; (17):41-46. doi:10.1111/cen.12248
42. Khadilkar A, Kadam N, Chiplonkar S, Fischer PR, Khadilkar V. School-based calcium-Vitamin D with micronutrient supplementation enhances bone mass in underprivileged Indian premenarchal girls. Bone. 2012; 51(1):1-7. doi: 10.1016/j.bone.2012.03.029
43. Patel P, Zulf Mughal M, Patel P, et al. Dietary calcium intake influences the relationship between serum 25-hydroxyVitamin D3 (25OHD) concentration and parathyroid hormone (PTH) concentration. Arch Dis Child. 2016; 101(4):316-319. doi: 10.1136/archdischild-2015-308985
44. Marwaha RK, Garg MK, Gupta S, et al. Association of insulin-like growth factor-1 and IGF binding protein-3 with 25-hydroxy Vitamin D in pre-pubertal and adolescent Indian girls. J Pediatr Endocrinol Metab. 2018; 31(3):289-295. doi: 10.1515/jpem-2017-0275
45. Prasad S, Rana RK, Seth R, Mauskar A V. A hospital-based study to establish the correlation between recurrent wheeze and Vitamin D deficiency among children of age group less than 3 years in Indian scenario. J Clin Diagnostic Res. 2016; 10(2):SC18-SC21. doi:10.7860/JCDR/2016/17318.7287.
46. Agarwal R, Virmani D, Jaipal ML, et al. Vitamin D status of low-birth-weight infants in Delhi: A comparative study. J Trop Pediatr. 2012; 58(6):446-450. doi:10.1093/tropej/fms013.
47. Wayse V, Yousafzai A, Mogale K, Filteau S. Association of subclinical Vitamin D deficiency with severe acute lower respiratory infection in Indian children under 5 y. Eur J Clin Nutr. 2004; 58(4):563-567. doi: 10.1038/sj.ejcn.1601845
48. Filteau S, Rehman AM, Yousafzai A, et al. Associations of Vitamin D status, bone health and anthropometry, with gross motor development and performance of school-aged Indian children who were born at term with low birth weight. BMJ Open. 2016; 6(1). doi: 10.1136/bmjopen-2015-009268
49. Gupta T, Wahi S, Gupta N, Arora S, Gupta S, Bhatia P. Correlation of Vitamin D Levels in Term Normotensive and Pre-eclamptic Patients in Labor. J Obstet Gynecol India. 2016; 66(3):154-159. doi: 10.1007/s13224-014-0663-8
50. Sreedharan M, Devadathan K, Kunju PAM, et al. Vitamin D Deficiency in Ambulant Children on Carbamazepine or Sodium Valproate Monotherapy. Indian Pediatr. 2018; 55(4):307-310. doi: 10.1007/s13312-018-1273-9
51. Agarwal N, Faridi MMA, Aggarwal A, Singh O. Vitamin D status of term exclusively breastfed infants and their mothers from India. Acta Paediatr. 2010; 99(11):1671-1674. doi:10.1111/j.1651-2227.2010.01912.x
52. Mathur NB, Saini A, Mishra TK. Assessment of adequacy of supplementation of Vitamin D in very low birth weight preterm neonates: A randomized controlled trial. J Trop Pediatr. 2016; 62(6):429-435. doi:10.1093/tropej/fmv110
53. Kumar GT, Sachdev HS, Chellani H, Rehman AM, Singh V, Arora H, Filteau S. Effect of weekly Vitamin D supplements on mortality, morbidity, and growth of low birthweight term infants in India up to age 6 months: randomised controlled trial. Bmj. 2011; 342: d2975. doi:10.1136/bmj.d2975
54. Marwaha RK, Tandon N, Chopra S, et al. Vitamin D status in pregnant Indian women across trimesters and different seasons and its correlation with neonatal serum 25-hydroxyVitamin D levels. Br J Nutr. 2011; 106(9):1383-1389. doi: 10.1017/S000711451100170X
55. Agrawal A, Gupta A, Shrivastava J. Role of Vitamin-D Deficiency in Term Neonates with Late-Onset Sepsis: A Case-Control Study. J Trop Pediatr. 2019; 65(6):609-616. doi:10.1093/tropej/fmz021
56. Shukla K, Sharma S, Gupta A, Raizada A. Current Scenario of Prevalence of Vitamin D Deficiency in Ostensibly Healthy Indian Population: A Hospital Based Retrospective Study. Indian J Clin Biochem. 2016; 31(4):452-457. doi: 10.1007/s12291-016-0552-2
57. Schulze KJ, Christian P, Wu LS-F, et al. Micronutrient Deficiencies Are Common in 6- to 8-Year-Old Children of Rural Nepal, with Prevalence Estimates Modestly Affected by Inflammation. J Nutr. 2014; 144(6):979-987. doi:10.3945/jn.114.192336
58. Haugen J, Ulak M, Chandyo RK, Henjum S, Thorne-Lyman AL, Ueland PM, Midtun Ø, Shrestha PS, Strand TA. Low prevalence of Vitamin D insufficiency among Nepalese infants despite high prevalence of Vitamin D insufficiency among their mothers. Nutrients. 2016 Dec; 8(12):825. doi: 10.3390/nu8120825
59. Avagyan D, Neupane SP, Gundersen TE, Madar AA. Vitamin D status in pre-school children in rural Nepal. Public Health Nutr. 2016; 19(3):470-476. doi: 10.1017/S136898001500083X
60. Marasinghe E, Chackrewarthy S, Abeysena C, Rajindrajith S. Micronutrient status and its relationship with nutritional status in preschool children in urban Sri Lanka. Asia Pac J Clin Nutr. 2015; 24(1):144-151. doi:10.6133/apjcn.2015.24.1.17
61. Hettiarachchi M, Liyanage C. Coexisting micronutrient deficiencies among Sri Lankan pre-school children: A community-based study. Matern Child Nutr. 2012; 8(2):259-266. doi:10.1111/j.1740-8709.2010.00290.x
62. Hettiarachchi M, Lekamwasam S, Liyanage C. Bone mineral density and nutritional status of healthy Sri Lankan preschool children. Int J Endocrinol Metab. 2011; 9(2):335-340. doi:10.5812/kowsar.1726913x.2385
63. Anwar S, Iqbal MP, Azam I, et al. Urban and rural comparison of Vitamin D status in Pakistani pregnant women and neonates. J Obstet Gynaecol. 2016; 36(3):318-323. doi:10.3109/01443615.2015.1050647.
64. Karim SA, Nusrat U, Aziz S. Vitamin D deficiency in pregnant women and their new borns as seen at a tertiary-care center in Karachi, Pakistan. Int J Gynecol Obstet. 2011; 112(1):59-62. doi: 10.1016/j.ijgo.2010.07.034
65. Ahmed AS, Ahmed T, Long KZ, et al. Prevalence and risk factors of Vitamin D insufficiency and deficiency among 6-24-month-old underweight and normal-weight children living in an urban slum of Bangladesh. Public Health Nutr. 2017; 20(10):1718-1728. doi: 10.1017/S1368980015003353.
66. Manaseki-Holland S, Mughal MZ, Bhutta Z, Shams MQ. Vitamin D status of socioeconomically deprived children in Kabul, Afghanistan. Int J Vitam Nutr Res. 2008; 78(1):16-20. doi:10.1024/0300-9831.78.1.16.
67. Mogire RM, Mutua A, Kimita W, Kamau A, Bejon P, Pettifor JM, Adeyemo A, Williams TN, Atkinson SH. Prevalence of vitamin D deficiency in Africa: a systematic review and meta-analysis. Lancet Glob Health. 2020; 8(1): e134-42.doi: 10.1016/S2214-109X(19)30457-7
68. World Health Organisation (WHO) [Internet] Levels and trends in child malnutrition worldwide. Available from:<https://www.who.int/nutgrowthdb/jme_brochoure2017.pdf>
69. Kumar KM. Incidence trends for childhood type 1 diabetes in India. Indian J Endocrinol Metab.2015 (Suppl 1): S34. doi: 10.4103/2230-8210.155378.
70 Rahman S, Islam MT, Alam DS. Obesity and overweight in Bangladeshi children and adolescents: a scoping review. BMC Public Health. 2014; 14(1):1-8. doi: 10.1186/1471-2458-14-70.
71 World Health Organisation (WHO) [Internet] Momentum on Child TB: South East Asia (SEA). Available from: <https://www.who.int/tb/areas-of-work/children/highlights_SouthEastAsia.pdf?ua=1>
72. Mavridou A, Pappa O, Papatzitze O, et al. Exotic tourist destinations and transmission of infections by swimming pools and hotsprings — A literature review [map]. Int J Environ Res Public Health. 2018; 15(12). doi: 10.3390/ijerph15122730.
73. Pereira-Santos M, Santos JY, Carvalho GQ, Santos DB, Oliveira AM. Epidemiology of vitamin D insufficiency and deficiency in a population in a sunny country: Geospatial meta-analysis in Brazil. Crit Rev Food Sci Nutr. 2019;59(13):2102-9. doi: 10.1080/10408398.2018.1437711
74. Badawi A, Arora P, Sadoun E, Al-Thani AA, Al Thani MH. Prevalence of vitamin D insufficiency in Qatar: a systematic review. J Public Health Res. 2012;1(3):229. doi: 10.4081/jphr.2012.e36
75. Siddiqee MH, Bhattacharjee B, Siddiqi UR, Rahman MM. High prevalence of vitamin D insufficiency among South Asian pregnant women: A systematic review and meta-analysis. Br J Nutr. Forthcoming 2021. doi: 10.21203/rs.3.rs-328883/v1
76. Shams S. Why wearing the burqa is on the rise in South Asia? DW. 2016 Aug 24; World (Asia). Accessed December 30, 2020. https://www.dw.com/en/why-wearing-the-burqa-is-on-the-rise-in-south-asia/a-19497638
77. UNICEF [Internet] South Asia. Adolescent and women’s nutrition. Available from: <https://www.unicef.org/rosa/what-we-do/nutrition/adolescent-and-womens-nutrition> Accessed December 2, 2020.
78. UNICEF [Internet] South Asia. Gender equality. Available from: <https://www.unicef.org/rosa/what-we-do/gender-equality> Accessed December 2, 2020.
79. Afifi L, Saeed L, Pasch LA, Huddleston HG, Cedars MI, Zane LT, Shinkai K. Association of ethnicity, Fitzpatrick skin type, and hirsutism: a retrospective cross-sectional study of women with polycystic ovarian syndrome. Int J Womens Dermatol. 2017; 3(1):37-43. doi: 10.1016/j.ijwd.2017.01.006.
80. Cashman KD, Dowling KG, Škrabáková Z, et al. Vitamin D deficiency in Europe: Pandemic? Am JClinNutr. 2016; 103(4):1033-1044. doi:10.3945/ajcn.115.12087
81. Benskin LL. A Basic Review of the Preliminary Evidence That COVID-19 Risk and Severity Is Increased in Vitamin D Deficiency. Front Public Health. 2020; 8:513. doi: 10.3389/fpubh.2020.00513.
82. Khadilkar A, Khadilkar V, Chinnappa J, Rathi N, Khadgawat R, Balasubramanian S et al. Prevention and treatment of vitamin D and calcium deficiency in children and adolescents: Indian Academy of Pediatrics (IAP) Guidelines. Indian pediatrics. 2017; 54(7): 567-73.doi: 10.1007/s13312-017-1070-x.
83. Bouillon R. Comparative analysis of nutritional guidelines for vitamin D. Nat Rev Endocrinol. 2017; 13(8):466. doi: 10.1038/nrendo.2017.
84. Cavelaars, A. E. et al. Nutri-RecQuest: a web-based search engine on current micronutrient recommendations. Eur J Clin Nutr. 64 (Suppl. 2) S43–S47 (2010). doi: 10.1038/ejcn.2010.60.
85. Aguiar M, Andronis L, Pallan M, Högler W, Frew E. Preventing vitamin D deficiency (VDD): A systematic review of Economic evaluations. Eur J Public Health. 2017; 27(2):292-301. doi: 10.1093/eurpub/ckw270
86. Arora HA, Dixit VI, Srivastava NI. Evaluation of knowledge, practices of vitamin D and attitude toward sunlight among Indian students. Asian Journal of Pharmaceutical and Clinical Research. 2016; 9(1):308.
87. Tariq A, Khan SR, Basharat A. Assessment of knowledge, attitudes and practice towards Vitamin D among university students in Pakistan. BMC Public Health. 2020; 20(1):1-0. doi: 10.1186/s12889-020-8453-y
88. World Health Organisation (WHO) [Internet] Adolescence: a period needing special attention. Available from: <https://apps.who.int/adolescent/second-decade/section2/page1/recognizingadolescence.html>Accessed June 2, 2021.