Received: 9 July 2020
Accepted: 3 September 2020
First Online: 11 September 2020
Ethics approval and consent to participate
: The study protocol was approved by The Jikei University Institutional Review Board (31-011) and the ethics committees of all other participating hospitals with an opt-out policy from the patient or their proxy.
: Not applicable.
: The authors declare that they have no competing interests.