HETEROTOPIC GASTRIC MUCOSA OF THE ESOPHAGUS AS A POTENTIAL CAUSE OF PEPTIC STENOSIS AFTER ROUX-EN-Y GASTRIC BYPASS - João Victor Vecchi Ferri; Wagner Herbert Sobottka; José Alfredo Sadowski; Gustavo Rodrigues Alves Castro; Vitor Mamoru Haida; Marcela Scardua Cocicov; João Caetano Dallegrave Marchesini (ABCD: Arquivos Brasileiros de Cirurgia Digestiva)