1. Prevalence and Socioeconomic Impact of Upper Gastrointestinal Disorders in the United States: Results of the US Upper Gastrointestinal Study 
Michael Camilleri, Dominique Dubois, Bernard Coulie, Michael Jones, Peter J. Kahrilas, Anne M. Rentz, Amnon Sonnenberg, Vincenzo Stanghellini, Walter F. Stewart, Jan Tack, Nicholas J. Talley, William Whitehead, Dennis A. Revicki 
Clinical Gastroenterology and Hepatology 
Volume 3, Issue 6, Pages (June 2005)
DOI: /S (05)
Copyright © 2005 American Gastroenterological Association Terms and Conditions

2. Figure 1 Results of cluster analysis of gastrointestinal symptoms.
Clinical Gastroenterology and Hepatology 2005 3, DOI: ( /S (05) )
Copyright © 2005 American Gastroenterological Association Terms and Conditions