Umer Saeed1 , Zoolfishan Imran2 , Jamil Ahmed3 , Saman Saeed4 , Faheem Mahmood5 , Mohammad Rizwan6, “PLASMA VITAMIN D TRENDS ACROSS VARIOUS AGE GROUPS IN THE COSMOPOLITAN CITY OF PAKISTAN”, JPUMHS, vol. 13, no. 2, pp. 177–183, Jun. 2023.