Harato, Kengo http://orcid.org/0000-0003-1796-2823
Sakurai, Aiko
Morishige, Yutaro
Kobayashi, Shu
Niki, Yasuo
Nagura, Takeo
Article History
Received: 17 July 2019
Accepted: 24 September 2019
First Online: 30 October 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee and Institutional Review Board of Keio University Hospital (IRB No. 20080054). A written informed consent was collected from each male volunteer.
: The authors declare that they have no competing interests.