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The remaining authors declare no competing interests.","order":1,"name":"Ethics","label":"Conflict of interest","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"This study was approved by the Tokyo CCU Network Ethical Review Board (Approval Number: 16-002).","order":2,"name":"Ethics","label":"Institutional Review Board statement","group":{"name":"EthicsHeading","label":"Declarations"}}]}}