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He has also received honoraria for speaking engagements and educational events from Eisai Co., Ltd., Taisho Pharmaceutical Co., Ltd., Kyowa Kirin Co., Ltd., GlaxoSmithKline K.K., Takeda Pharmaceutical Co., Ltd., Kissei Pharmaceutical Co., Ltd., and Vantive Japan. RI has received honoraria for speaking engagements and educational events from Astellas Pharma Inc., Novartis Pharma K.K., Otsuka Pharmaceutical and Vantive Japan. TT has received consulting fees from Astellas Pharma Inc. He has also honoraria for speaking engagements and educational events from Torii Pharmaceutical Co., Ltd., Ono Pharmaceutical Co., Ltd., Kyowa Kirin Co., Ltd., AstraZeneca K.K., Kissei Pharmaceutical Co., Ltd., and Nobelpharma Co., Ltd. MA has received payment for speaking from Novartis Pharma K.K., Otsuka Pharmaceutical. SY has received honoraria and consulting fee from Sanwa Kagaku Kenkyusho Co., Ltd. (SKK); honoraria from Kyowa Kirin Co., Ltd., Kissei Pharmaceutical Co., Ltd., Ono Pharmaceutical Co., Ltd., and Torii Pharmaceutical Co., Ltd.; and research fundings from Toray Medical Co., Ltd. and Kaneka Medix Co., Ltd.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interests"}},{"value":"All data were de-identified prior to analysis. This study was conducted in accordance with the Act on the Protection of Personal Information in Japan, the Ethical Guidelines for Epidemiological Research issued by the Ministry of Education, Culture, Sports, Science and Technology and the Ministry of Health, Labour and Welfare, and the STROBE guidelines. The study protocol was approved by the Ethics Committee of the Japanese Society for Dialysis Therapy (approval number 68).","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}},{"value":"The data used in this study contained no identifying personal information. The requirement for informed consent was waived by the Medicine Ethics Committee of the JSDT.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent to participate"}},{"value":"Not applicable.","order":5,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}}]}}