title: Vitamin B12 deficiency--a major cause of megaloblastic anaemia in patients attending a tertiary care hospital.
authors.affiliation: Department of Pathology and Microbiology, Aga Khan University, Karachi, Pakistan.
authors.forename: Saira Perwaiz
authors.initials: SP
authors.lastname: Iqbal
authors.forename: Ghulam Nabi
authors.initials: GN
authors.lastname: Kakepoto
authors.forename: Saleem Perwaiz
authors.initials: SP
authors.lastname: Iqbal