Funding for this research was provided by:
National Institute of Allergy and Infectious Diseases (UM1 AI068619)
Received: 22 July 2019
Accepted: 30 March 2020
First Online: 7 May 2020
Ethics approval and consent to participate
: This study involved only analysis of data from published scientific literature; we did not collect any primary data.
: Not applicable.
: The authors declare that they have no competing interests.