Funding for this research was provided by:
Japan Agency for Medical Research and Development
Ministry of Education, Culture, Sports, Science and Technology (20K16605, 18K15461, 15K09319, 18K07506)
Received: 13 September 2020
Accepted: 1 December 2020
First Online: 4 January 2021
Ethics approval and consent to participate
: Written informed consent from the participants was obtained when possible and, if not, from the nearest relative. The study protocols were approved by the University Ethics Committee (ERB-G-12, Kyoto Prefectural University of Medicine, Kyoto, Japan).
: Not applicable.
: The authors had no competing financial interests. Also, no non-financial conflicts of interest existed.