RT Journal Article SR Electronic T1 The learning curve for detection of non-polypoid (flat and depressed) colorectal neoplasms JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 184 OP 185 DO 10.1136/gutjnl-2013-305743 VO 64 IS 1 A1 McGill, Sarah K A1 Kaltenbach, Tonya A1 Friedland, Shai A1 Soetikno, Roy YR 2015 UL http://gut.bmj.com/content/64/1/184.abstract AB