Funding for this research was provided by:
National Institute of Allergy and Infectious Diseases (2RO1AI071752)
Received: 29 April 2019
Accepted: 16 August 2019
First Online: 2 September 2019
Ethics approval and consent to participate
: The study design and protocol were approved by the Institutional Review Board (IRB) of Middle Tennessee State University under protocol # 15-301. All participants provided written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.