Bhatta, R. D., N. Pradhan, R. Gurung, and P. Risal. “Hypovitaminosis D in Healthy Health Care Professionals: A Real Deficiency or Necessity of New Reference Value for Specific Population?”. Journal of Lumbini Medical College, vol. 6, no. 1, June 2018, pp. 1-5, https://nepjol.info./index.php/JLMC/article/view/20425.