Li, Danjie
Akiyama, Hideo
Kishi, Shoji
Article History
Received: 18 October 2017
Accepted: 3 July 2018
First Online: 16 July 2018
Ethics approval and consent to participate
: This study followed the tenets of the Declaration of Helsinki and was approved by the Ethics Committee of Graduate School of Medicine in Gunma University (IRB No.2017–072). Informed written consent was obtained from all participants or their parents (participants under the age of eighteen).
: Not applicable.
: The authors declare that they have no competing interests.
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