HASSAN, F.; AHMAD, K.; AYAZ, S.; KHALIL, H. SPECTRUM OF FINDINGS IN PATIENTS PRESENTING FOR UPPER GASTROINTESTINAL ENDOSCOPY AT A TERTIARY CARE HOSPITAL AND THE INFLUENCE OF AGE AND GENDER. Pakistan Armed Forces Medical Journal (PAFMJ), v. 71, n. 3, p. 744-48, 29 jun. 2021.