Hou, Chongxian
Ishi, Yukitomo
Motegi, Hiroaki
Okamoto, Michinari
Ou, Yafei
Chen, Jiawei
Yamaguchi, Shigeru http://orcid.org/0000-0003-3710-5888
Article History
Received: 17 July 2019
Accepted: 5 September 2019
First Online: 10 September 2019
Compliance with ethical standards
:
: The authors declare no conflict of interest.
: The present study was approved by the local Ethics Committee at Hokkaido University Hospital (Sapporo, Japan; 015–0154). As this study was retrospective, informed consent was waived by the IRB. All procedures performed in the present study were in accordance with 1964 Helsinki Declaration and its later amendments.