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”. Journal of Peoples University of Medical &Amp; Health Sciences Nawabshah. (JPUMHS), vol. 13, no. 2, June 2023, pp. 177-83, http://publication.pumhs.edu.pk/index.php/ojs/article/view/765.