Khattak, A.K., Ahmad, S., Hassan, M.K., Khan, H., Masood, A. and Ahmad, M. 2018. EFFICACY OF TWO LITRES POLYETHYLENE GLYCOL VERSUS FOUR LITRE POLYETHYLENE GLYCOL SOLUTION FOR BOWEL CLEANSING FOR COLONOSCOPY. Journal of Medical Sciences. 25, 1 (Mar. 2018), 76–79.