R. Iqbal, M. J. Sethi, and S. Sethi, “FREQUENCY OF VITAMIN A DEFICIENCY IN CHILDREN OF AGE 6 MONTHS TO 72 MONTHS AT THE OUT PATIENT OPHTHALMOLOGY DEPARTMENT OF AGENCY HEADQUARTER HOSPITAL LANDIKOTAL, KHYBER AGENCY”, J Postgrad Med Inst, vol. 21, no. 1, Aug. 2011.