Farrukh AbbuHazim, Urooj Ishrat, Tehseen Fatima, Neha Baqai, and Rafat Amin, “Evaluating the status of vitamin 25(OH) D levels among females of all age groups in Karachi, Pakistan.”, j Muhammad Med Coll, vol. 10, no. 2, pp. 55-58, May 2020.