1. Embryology of the esophagus;Blevins,2005
2. Embryology, anatomy, and physiology of the esophagus;Duranceau,2002
3. Anatomy of the esophagus;Hagen,2005
4. An overview of the upper esophageal sphincter;Lang;Curr Gastroenterol Rep,2000
5. Clinically oriented anatomy, embrology, and histology;Liebermann-Meffert,2008