Funding for this research was provided by:
Japan Society for the Promotion of Science (17J02763)
Received: 23 October 2018
Accepted: 17 December 2018
First Online: 3 January 2019
Ethics approval and consent to participate
: All participants 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.
: Not applicable
: The authors declare that they have no competing interests.
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