1. Factors Associated With Persistent and Nonpersistent Chronic Constipation, Over 20 Years 
Rok Seon Choung, G. Richard Locke, Enrique Rey, Cathy D. Schleck, Charles Baum, Alan R. Zinsmeister, Nicholas J. Talley 
Clinical Gastroenterology and Hepatology 
Volume 10, Issue 5, Pages (May 2012)
DOI: /j.cgh
Copyright © 2012 AGA Institute Terms and Conditions

2. Figure 1
Proportion of those with persistent CC, nonpersistent CC, or no CC.
Clinical Gastroenterology and Hepatology  , DOI: ( /j.cgh )
Copyright © 2012 AGA Institute Terms and Conditions