Funding for this research was provided by:
The Japanese Ministry of Health,Labour and Welfare research grant (H23-免疫-指定-017)
Received: 13 September 2016
Accepted: 11 July 2018
First Online: 31 July 2018
Ethics approval and consent to participate
: This study was approved by the Research Ethics Committee of The University of Tokyo Graduate School of Medicine and Faculty of Medicine. All participants provided their informed consent to participate in this study in written form.
: Not applicable.
: The authors declare that they have no competing interests.
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