Received: 31 May 2021
Accepted: 13 October 2021
First Online: 25 October 2021
: The present study was approved by the Japanese Ministry of Health, Labor, and Welfare, Japan Registry of Clinical Trails (jRCTs032180266). All methods were performed in accordance with the Declaration of Helsinki and the ethical standards of the institutional research committee.Signed informed consent was obtained from all patients in this study.
: Not applicable.
: MJ received a grant from Canon Medical Systems, which loaned the upright CT device to Keio University. The funder was not involved in the design of the study; the collection, analysis, or interpretation of the data; or the writing of the manuscript. The other authors declare that they have no conflicts of interest.