Received: 2 February 2020
Accepted: 4 June 2020
First Online: 9 June 2020
Ethics approval and consent to participate
: The research ethics committee of Muta Hospital approved the present study (date of approval: 15th May 2017, approval number: 29–001), and the study conformed to the Helsinki Declaration, as revised in 2013. The present study was also registered in the UMIN (ID: 000031357). We obtained informed consent by publishing an opt-out option on the homepage of Muta Hospital.
: Not applicable.
: The authors declare that they have no competing interests.