Funding for this research was provided by:
Japan Society for the Promotion of Science (15K11298)
Received: 8 August 2019
Accepted: 30 October 2019
First Online: 12 November 2019
Ethics approval and consent to participate
: This study was approved by the institutional review board of Yokohama City University and was conducted according to the Declaration of Helsinki. Written informed consent was obtained from all patients.
: Not applicable.
: The authors declare that they have no competing interests.