Funding for this research was provided by:
Japan Society for the Promotion of Science (17K15510, 16K08406)
Received: 5 February 2020
Accepted: 17 September 2020
First Online: 29 September 2020
Ethics approval and consent to participate
: The study is a retrospective observational study, carried out by the opt-out method of our hospital website. The ethics committee of Sakurajyuji Hospital approved the data collection from the patients’ medical records without their consent (the approval number and date: 2019–01 and April 16 2019, respectively). The hospital website presented this study and the information on how to opt out of the study and to contact the research manager (K.T.) by phone, e-mail or regular mail. The research manager (K.T.) was the only person responsible for obtaining the demographic and clinical data from the medical records of the included patients and also for deleting the data of those who opted out before the analyses were carried out. The study complies with the Declaration of Helsinki, and all analyses were performed in accordance with Ethical Guidelines for Medical and Health Research Involving Human Subjects in Japan.
: Not applicable.
: The authors declare that they have no conflicts of interest.