1. Breath Tests for Gastrointestinal Disease: The Real Deal or Just a Lot of Hot Air? 
Richard J. Saad, William D. Chey 
Gastroenterology 
Volume 133, Issue 6, Pages (December 2007)
DOI: /j.gastro
Copyright © 2007 AGA Institute Terms and Conditions

2. Figure 1 Schematic for urea breath testing.
Gastroenterology  , DOI: ( /j.gastro )
Copyright © 2007 AGA Institute Terms and Conditions

3. Figure 2 Schematic for carbohydrate breath testing.
Gastroenterology  , DOI: ( /j.gastro )
Copyright © 2007 AGA Institute Terms and Conditions