Unroofing technique: effective “incomplete” endoscopic resection of large esophageal lymphangiomas - Matsushita, Mitsunobu; Ueshima, Takayuki; Nishimon, Shuhei; Takahashi, Mio; Asayama, Toshiki; Shibatani, Nobuyuki; Fujimura, Kazuyo (Endoscopy, 2020)