Received: 15 January 2020
Accepted: 28 February 2020
First Online: 12 March 2020
Ethics approval and consent to participate
: This study was reviewed and approved by the Mie University Institutional Review Board (IRB#: H2018–064). Due to the retrospective nature without identifiable patient information, the requirement for informed consent was waived.
: Not applicable.
: The authors declare that they have no competing interests.