Management of early gastric cancer with positive horizontal or indeterminable margins after endoscopic submucosal dissection: multicenter survey oleh Naoki Ishii, Fumio Omata, Junko Fujisaki, Toshiaki Hirasawa, Mitsuru Kaise, Shu Hoteya, Satoshi Tanabe, Kenji Ishido, Ken Ohata, Maiko Takita, Tetsuya Mine, Muneki Igarashi, Tatsuya Yoshida, Yuichi Takeda, Yohei Furumoto, Kenshi Matsumoto, Naohisa Yahagi, Hirotaka Nakashima, Tomonori Wada, Tomoko Tagata, Atsushi Mitsunaga