Muhammad Nayyab Tahir, Husnain Athar, Maheen Shahid, Raneesha Umer, Abrar Ul H Aq 2023. Frequency of Vitamin B12 Deficiency in patients of Pancytopenia. Pakistan Journal of Medical & Health Sciences. 16, 12 (Jan. 2023), 40. DOI:https://doi.org/10.53350/pjmhs2022161240.