Muhammad Nayyab Tahir, Husnain Athar, Maheen Shahid, Raneesha Umer, Abrar Ul H Aq. “Frequency of Vitamin B12 Deficiency in Patients of Pancytopenia”. Pakistan Journal of Medical & Health Sciences 16, no. 12 (January 11, 2023): 40. Accessed November 21, 2024. https://mail.pjmhsonline.com/index.php/pjmhs/article/view/3493.