Nakayama, Hirokazu http://orcid.org/0000-0001-9758-8004
Echizen, Hirotoshi
Ogawa, Ryuichi
Orii, Takao
Kato, Toshiaki
Article History
First Online: 19 July 2018
Compliance with Ethical Standards
:
: This research did not receive any specific grant from funding agencies in the public, commercial, or non-profitable organizations.
: The authors declare no conflicts of interest.
: The protocol of the present study was approved by the Ethics Committee of NTT Medical Centre Tokyo (Reference No. 16-1319) prior to the study.