Article History
Received: 13 April 2018
Accepted: 20 July 2018
First Online: 26 July 2018
Compliance with Ethical Standards
:
: Ippei Kanazawa, Sayuri Tanaka, and Toshitsugu Sugimoto declare that they have no conflicts of interest.
: This study was approved by IRB of our university and informed consent was waived because no intervention and further examinations were performed.