Funding for this research was provided by:
Japan Society for the Promotion of Science (15K10463, 17K16676)
Received: 22 November 2017
Accepted: 28 February 2018
First Online: 9 March 2018
Ethics approval and consent to participate
: This study was approved by local institutional review boards (the Medical Research Ethics Committee of Tokyo Medical and Dental University and the Hospital Ethics Committee of Juntendo University Hospital), and written consent was obtained from all study subjects.
: Not applicable.
: The authors declare that they have no competing interests.
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