1. Barium esophagography: a study for all seasons;Levine;Clin Gastroenterol Hepatol,2008
2. Examination of the esophagus, stomach, and duodenum: techniques and normal anatomy;Levine,2013
3. The gastric cardia in double-contrast study: its dynamic image;Herlinger;AJR Am J Roentgenol,1980
4. Gastroesophageal reflux disease;Levine,2015
5. Carcinoma of the esophagus;Levine,2015