Gastric neuroendrocrine tumor: review and update - Dias, Andre Roncon; Azevedo, Beatriz Camargo; Alban, Luciana Bastos Valente; Yagi, Osmar Kenji; Ramos, Marcus Fernando Kodama Pertille; Jacob, Carlos Eduardo; Barchi, Leandro Cardoso; Cecconello, Ivan; Ribeiro Junior, Ulysses; Zilberstein, Bruno (Abcd-arquivos brasileiros de cirurgia digestiva-brazilian archives of digestive surgery, 2017)