Received: 18 February 2020
Accepted: 7 September 2020
First Online: 14 September 2020
Ethics approval and consent to participate
: The study ethics approval was granted from the local ethical committee of the University of Tokyo Hospital, and the study was performed in accordance with the principles of the Declaration of Helsinki. Written informed consent was obtained from all patients, including the patient who died during the study.
: Not applicable.
: The authors declare that they have no competing of interests.