Article History
Received: 15 April 2020
Accepted: 2 August 2020
First Online: 7 August 2020
Compliance with ethical standards
:
: All the authors have no conflict of interest to declare.
: The protocol was approved by the ethical committee of Sapporo City General hospital (H30-059-515).
: All participants provided written informed consent in accordance with the Declaration of Helsinki. Patients were notified of the protocol of this study in our hospital and could opt out of the patient list at any time.
: All participants provided written informed consent regarding publishing their data.