Lo Tártaro, M.; Ottone, N.; Medan, C.; Blasi, E.; Bertone, V. Weak Areas of the Pharyngoesophageal Narrowing (Pharyngoesophageal Union): Anatomic Description and Implication on the Development of Pharyngoesophageal Diverticulum. Int J Med Surg Sci 2014, 1, 275-284.