Correction: Clinical utility of novel ultrathin single-balloon enteroscopy: a feasibility study - Takabayashi, Kaoru; Hosoe, Naoki; Miyanaga, Ryoichi; Fukuhara, Seiichiro; Kimura, Kayoko; Mizuno, Shinta; Naganuma, Makoto; Yahagi, Naohisa; Ogata, Haruhiko; Kanai, Takanori (Endoscopy, 2019)