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The Ethical Review Board, National Cancer Center Japan approved the study protocol.","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":"Dr. Shimizu has received a Grant-in-Aid for Scientific Research (C) from the Japan Society for the Promotion of Science (15K08832), from Research for Promotion of Cancer Control Programmes (H27-political-general), and from Tsumura & Co. Dr. Sadahiro has received Sasakawa Foundation Butterfield awards (B108) and a grant from SGH Foundation. Dr. Matsuoka has received a Grant-in-Aid for Scientific Research (B) from the Japan Society for the Promotion of Science (17H04253), an intramural research grant for Neurological and Psychiatric Disorders from the National Center of Neurology and Psychiatry Japan (27-3-2), and a grant from SENSHIN Medical Research Foundation, and has also received speaker\u2019s honoraria from Eli Lilly Japan K.K., Morinaga Milk Industry Co., Ltd., and Takeda Pharmaceutical Company Ltd. Dr. Uchitomi has received Grants from the National Cancer Center Research and Development Fund (27-A-3), Research for Promotion of Cancer Control Programmes (H29-political-general), and Japan Agency for Medical Research and development, AMED. Dr. Yamaguchi received consulting fees from Tsumura & Co.","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":"110"}}