Akhtar, Saeed, Anwaar Ahmed, Muhammad Atif Randhawa, Sunethra Atukorala, Nimmathota Arlappa, Tariq Ismail, and Zulfiqar Ali. 2014. “Prevalence of Vitamin A Deficiency in South Asia: Causes, Outcomes, and Possible Remedies”. Journal of Health, Population and Nutrition 31 (4):413-23. https://doi.org/10.3329/jhpn.v31i4.19975.