Safety, efficacy, and long-term outcomes for endoscopic submucosal dissection of early esophagogastric junction cancer Masami OmaeJunko FujisakiYusuke HoriuchiNatsuko YoshizawaYasumasa Matsuo • Manabu KubotaTakanori SuganumaKazuhisa OkadaAkiyoshi IshiyamaToshiaki Hirasawa • Yorimasa YamamotoTomohiro