Srivastava, V., S. Kumar, S. Ahmad, V. Singh, N. Rai, and R. Singh. “Association of Level Serum 25-Hydroxy Vitamin D in Benign and Malignant Breast Disease in a Tertiary Care Center in North India”. International Surgery Journal, vol. 7, no. 6, May 2020, pp. 1857-61, doi:10.18203/2349-2902.isj20202396.