Effect of adding magnifying BLI, magnifying NBI, and iodine staining to white light imaging in diagnosis of early esophageal cancer oleh Kenro Kawada, Miwako Arima, Ryoji Miyahara, Mika Tsunomiya, Masakazu Kikuchi, Fumiko Yamamoto, Akihiro Hoshino, Yasuaki Nakajima, Yusuke Kinugasa, Tatsuyuki Kawano