Comparison of optimal bowel cleansing effects of 1L polyethylene glycol with ascorbic acid versus sodium picosulfate with magnesium citrate: A randomized controlled study. - Lee, Jun; Kim, Seong-Jung; Kim, Sang-Wook; Song, Hyo-Yeop; Seo, Geom Seog; Kim, Dong-Hyun; Myung, Dae-Seong; Kim, Hyun-Soo; Joo, Young-Eun; Kim, So Yeong (PLoS ONE, 2022)