Afrin, S. F., M. H. Rahman, K. F. Bari, and A. K. A. Mahmood. “Status of Vitamin D by Measuring 25 - Hydroxyvitamin D Level in Dhaka City”. Bangladesh Journal of Medical Science, vol. 18, no. 3, May 2019, pp. 624-7, doi:10.3329/bjms.v18i3.41638.