Funding for this research was provided by:
National Institutes of Health (#D43 TW010540, R15-AI28714-01)
Received: 15 January 2020
Accepted: 24 April 2020
First Online: 11 May 2020
Ethics approval and consent to participate
: No ethics approval or consent were obtained since this is a review of previously published peer-reviewed articles and no new participant data is used or reported.
: Not applicable.
: The authors declare that they have no competing interests.