Received: 7 August 2019
Accepted: 30 October 2019
First Online: 21 November 2019
Ethics approval and consent to participate
: The present study was approved by the ethics committee of Shiga University of Medicine (approval number: 28–27). No consent was obtained from participating patients, because the data were collected retrospectively from electronic medical records.
: Not applicable.
: The authors declare that they have no competing interests.