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dr. haseeb ahmed bhatti haseeb ahmed bhatti ziauddin university bhatti ppt malabsorption abg microbial keratitis corneal infection eye infection ophthalmology viral keratitis causes of anemia ear problems otitis media ent haseeb bhatti iron deficiency anemia dermatology diarrhea megaloblastic anemia thlessemia sickle cell disease dr haseeb ahmed anemia bacterial overgrowth syndrome dr bhatti whipple disease celiac disease malabsorption syndromes secretory diarhea dr. bhatti diarhea inflamatory diarhea chronic diarhea malabsorption syndrome anemia approach acid-base disorders abgs arterial blood gases