1. Volume 123, Issue 6, (December 2002)
Ewald of the Ewald tube 
William S. Haubrich, M.D. 
Gastroenterology 
Volume 123, Issue 6, (December 2002)
DOI: /gast
Copyright © 2002 American Gastroenterological Association Terms and Conditions

2. Copyright holder unknown
Copyright holder unknown. Photo obtained from the National Library of Medicine Website (
Gastroenterology  , DOI: ( /gast )
Copyright © 2002 American Gastroenterological Association Terms and Conditions