160. What are the respective indications for: - the Collis-Belsey procedure? - the Collis-Nissen procedure?
B.C. Urschel (Dallas)

161. What are the comparative results of the Collis-Nissen procedure, - with gastric section - without gastric section?
A.G. Little (Las Vegas)

162. What are the advantages of the Collis-Nissen procedure in cases of stricture?
M.B. Orringer (Ann Arbor)

163. What is the risk of dehiscence of the suture of the neo-esophageal tube?
J. Testart (Rouen)

164. What are the undesirable effects of Collis operation?
RJ. Ginsberg (New York)

165. How to interpret the persistence of esophageal acidity after Collis operation?
J. Testart (Rouen)