Received: 22 October 2020
Accepted: 25 January 2021
First Online: 11 February 2021
Ethics approval and consent to participate
: This study was performed in accordance with the Declaration of Helsinki and was approved by the ethical committees of Faculty of Medicine of the Kyushu University (Number 2019–587). Also, we used existing and de-identified clinical data of a hospital, and obtaining informed consents from all participants is difficult. In this case, informed consent from all the participants are not essential according to Ethical Guidelines for Medical and Health Research Involving Human Subjects in Japan (ExternalRef removed). In addition, need of informed consent from participants was waived by the ethics committee of Faculty of Medicine of the Kyushu University. Instead, we made an opportunity for declining participation in this study by disclosing information about this study in our homepage (ExternalRef removed).
: The authors declare that they have no competing interest.