Funding for this research was provided by:
Centers for Disease Control, R.O.C. (MOHW106-CDC-C-114-000705)
Ministry of Science and Technology, Taiwan (MOST108-2410-H-038-013-MY3)
Received: 13 August 2019
Accepted: 16 February 2020
First Online: 4 March 2020
Ethics approval and consent to participate
: This study used the open dataset without information regarding any individual. Therefore, ethics approval is not required.
: Not applicable.
: The authors declare they have no competing interests.