Received: 7 May 2020
Accepted: 26 May 2020
First Online: 11 June 2020
Ethics approval and consent to participate
: This study was reviewed and approved by the ethics committee of New Tokyo Hospital (Matsudo, Chiba, Japan, approval ID: 0175) and that of the Saitama Red Cross Hospital (Omiya, Saitama, Japan, approval ID: 18- AO).
: This study took the opt-out method to obtain consents for publication and participation.
: The authors declare that they have no competing interests.