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Additionally, the study protocol was approved by the ethics committee of Nagoya University School of Medicine (approval no. 2014\u20130421). Ethical approval was also obtained from each participating hospital (Additional file ), and each patient provided written informed consent to be registered to this study. Treatment methods and hospital care for the patients are not altered due to participation in this study.","order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Not applicable.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"No conflict of interest declared.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}},{"value":"Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Publisher\u2019s Note"}}],"article-number":"159"}}