Funding for this research was provided by:
Japan Agency for Medical Research and Development (JP20fk0210056, H25-kanen-ippan-011)
Grant from the National Center for Global Health and Medicine (19A1017, 30-shi-2007, 28-shi-001)
Received: 8 October 2020
Accepted: 25 January 2021
First Online: 2 March 2021
: The authors declare no competing interests.