Funding for this research was provided by:
Japan Society for the Promotion of Science (JP26870586)
Received: 8 November 2019
Accepted: 27 May 2020
First Online: 4 June 2020
Ethics approval and consent to participate
: The study protocol was approved by the Institutional Review Board of Showa University Koto Toyosu Hospital (No. 16 T7029). Informed consent was obtained in the form of an opt-out on the hospital website.
: Not applicable.
: The authors declare that they have no competing interests.