Endoscopic Submucosal Dissection of Esophageal Squamous Cell Neoplasms MITSUHIRO FUJISHIRO,* NAOHISA YAHAGI,* NAOMIKAKUSHIMA,* SHINYA KODASHIMA,* YOSUKE MURAKI,* SATOSHI ONO,* NOBUTAKE YAMAMICHI,* AYAKO TATEISHI,* YASUHITO SHIMIZU,‡ MASASHI OKA,‡ KEIJI