Muhammad Amin1, Jahan Sardar, Muhammad Nadeem, Shafqat Huma, Memoona Gulzar, Momal Rasheed, M. Ibrahim Khan 2022. Frequency of Vitamin B12 Deficiency Amongst Elderly Patients Presenting with Dementia. Pakistan Journal of Medical & Health Sciences. 16, 06 (Aug. 2022), 705. DOI:https://doi.org/10.53350/pjmhs22166705.