T. . Tasrin, A. . Siddiquea, N. . Hossain, and M. . Mozaffor, “Comparison of Serum Vitamin D Level between Outdoor and Indoor Working Professionals and Its Correlation with Serum Parathyroid Hormone Level”, J Bangladesh Soc Physiol, vol. 17, no. 2, pp. 78–84, May 2024.