@article{article4a967a68,
title   = {Achalasia: a prospective study comparing the results of dilation and myotomy},
author = {Felix, Valter Nilton and Zilberstein, Bruno and Moraes Filho, Joaquim Prado Pinto de and Pinotti, Henrique Walter},
year = {1998},
journal   = {Hepato-Gastroenterology}
}