In the original publication, under Introduction section, the sentence starting with: “In addition,…” should read as: In addition, the revised Medical Care Act of September 2015 established the "Regional Medical Cooperation Promotion Agency" system [5–6], making it possible for multiple hospitals and nursing care facilities with different management bases to share functions and improve the quality of services as if they were one hospital. Under the heading Definition of ultra-low-volume hospitals and centralization of Method section, the sentence starting with: “In this study….” should read as: In this study, based on previous studies and discussions with clinical experts, we defined an "ultra-low-volume hospital" as a hospital with fewer than two esophagectomy cases per year [11, 26]. In Table 3, the value “0.856 (95% CI 0.639–1.147) *p = 0.298” should be listed under the year “2014”. The updated Table 3 is given in this correction.
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