Optimizing adequacy of bowel cleansing for colonoscopy: recommendations from the US multi-society task force on colorectal cancer - Johnson, David A; Barkun, Alan N; Cohen, Larry B; Dominitz, Jason A; Kaltenbach, Tonya; Martel, Myriam; Robertson, Douglas J; Boland, C Richard; Giardello, Frances M; Lieberman, David A; Levin, Theodore R; Rex, Douglas K (Gastroenterology (New York, N.Y. 1943), 2014)