Funding for this research was provided by:
Japan Society for the Promotion of Science (16J04125)
Received: 26 March 2018
Accepted: 24 May 2018
First Online: 8 June 2018
Ethics approval and consent to participate
: All subjects gave their written informed consent after a complete explanation of this study before participating in the study. The study was performed in accordance with the guidelines of the Declaration of Helsinki and was approved by the ethics committee of the Kyushu University.
: The authors declare that they have no competing interests.
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