@article{article9bbf12a3,
title   = {Achalasia: a prospective study comparing the results of dilatation and myotomy},
author = {Felix, Valter Nilton and Cecconello, Ivan and Zilberstein, Bruno and Moraes Filho, Joaquim Prado Pinto de and Pinotti, Henrique Walter},
year = {1998},
journal   = {Hepato-Gastroenterology}
}