C. Becaldo, A. Kuan, and L. Ong, “The diagnostic accuracy of papanicolau staining in brush biopsy as an alternative to tissue biopsy in patients undergoing colonoscopy for non-obstructing colonic tumors at Vicente Sotto Memorial Medical Center from February 2016 to September 2017: A prospective study”, PhilJGastro, vol. 9, no. 1, Jun. 2020.