Paladugu, L., V., A. P., Mureboina, J. and Tummala, A. C. (2020) “Study of serum vitamin D2 and calcium in young and middle aged healthy male smokers in rural tertiary care center”, International Journal of Advances in Medicine, 7(2), pp. 308–313. doi: 10.18203/2349-3933.ijam20200086.