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Rui Nakato, Noriaki Manabe, Naoshi Mitsuoka, Hironari Shiwaku, Hideo Matsumoto, Kanefumi Yamashita, Akiko Shiotani, Jiro Hata, Tetsuo Watanabe, Toshihiro Hirai, Ken Haruma. "Erratum to: Clinical experience with four cases of jackhammer esophagus." Esophagus 15.1 (2017) 52-52