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. Author manuscript; available in PMC: 2017 Aug 29.
Published in final edited form as: Gastrointest Endosc. 2015 Feb 7;81(5):1188–96.e1-7. doi: 10.1016/j.gie.2014.10.035

Figure 1.

Figure 1

Flow chart of the derivation and validation process. ROC, receiver operating characteristic curve; NPV, negative predictive value; PPV, positive predictive value.