Received: 1 March 2021
Accepted: 8 April 2021
First Online: 16 April 2021
: This study conforms to the Ethical Principles for Medical Research Involving Human Subjects issued by the Ministry of Health, Labour and Welfare and the Ministry of Education, Culture, Sports, Science, and Technology in Japan. Following these guidelines, the Shizuoka General Hospital Research Ethical Committee determined that individual patient informed consent was not required because this study was an analysis study of existing information and patients were given the right to refuse participation by disclosure. After obtaining the approval of this committee (SGHIRB#2017062) and publishing the disclosure document on Shizuoka General Hospital's website, the information of each individual was anonymized, and the analysis was conducted.
: Not applicable.
: The authors have no conflicts of interest to disclose.