Funding for this research was provided by:
Kurozumi Medical Foundation
Tokyo Hokenkai
Article History
Received: 2 October 2018
Accepted: 14 November 2018
First Online: 14 December 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The study protocol was reviewed by the University Health Network-Research Ethics Board (Research Ethics Board number 18-5104).
: In light of the retrospective design, the requirement of informed consent was waived.