Funding for this research was provided by:
Ministry of Education, Culture, Sports, Science and Technology (18K18412, 19K17127)
Received: 19 March 2020
Accepted: 13 October 2020
First Online: 13 November 2020
Ethics approval and consent to participate
: This retrospective study was approved by the Ethics Committee of Hokkaido University Hospital (IRB No. 019–0277) in accordance with 1964 Helsinki Declaration and its later amendments or comparable ethical standards. All images were anonymized prior to the analysis. Therefore, the requirement to obtain written informed consent was waived and patients were able to opt out of participation on our hospital website.
: Only anonymized data is published, and therefore no consent was obtained. See paragraph above.
: This work was supported in part by (and the Windows-PC for the reconstruction for the PET images at the Hokkaido University) was funded through a sponsored research agreement with Philips Healthcare. DS and PM are employee of Philips Japan and Philips Healthcare, respectively. Only non-Philips employees have control of any data that might present a conflict of interest for employees. All other authors have no conflict of interest to disclose.