1. Relationship Between Detection of Adenomas by Flexible Sigmoidoscopy and Interval Distal Colorectal Cancer 
Shari S. Rogal, Paul F. Pinsky, Robert E. Schoen 
Clinical Gastroenterology and Hepatology 
Volume 11, Issue 1, Pages (January 2013)
DOI: /j.cgh
Copyright © 2013 AGA Institute Terms and Conditions

2. Figure 1 PLCO subjects and examinations.
Clinical Gastroenterology and Hepatology  , 73-78DOI: ( /j.cgh )
Copyright © 2013 AGA Institute Terms and Conditions