Lower esophageal sphinter analysis using computerized manometry in patients with chagasic megaesophagus - Andrade, C. G.; Cecconello, I.; Nasi, A.; Zilberstein, Bruno; R. Filho, J.; Carvalho, P. J. de Campos; Donahue, P.; Gama Rodrigues, Joaquim José (Diseases of the esophagus, 2006)