Parajuli, A., and N. KC. “Predictors of Inadequate Bowel Preparation Using Two Liters of Polyethylene Glycol for Colonoscopy”. Journal of Kathmandu Medical College, vol. 9, no. 3, Sept. 2020, pp. 144-9, https://jkmc.com.np/ojs3/index.php/journal/article/view/1050.