Funding for this research was provided by:
U.S. Department of Veterans Affairs (1IK2CX001095)
National Institutes of Health (8UL1TR000114; 5KL2TR113)
National Institute of Allergy and Infectious Diseases (5T32AI055433)
Received: 29 November 2018
Accepted: 21 May 2019
First Online: 7 June 2019
Ethics approval and consent to participate
: The institutional review board for human studies at MVAMC approved the protocol (#4541-B) and written informed consent was obtained from the subjects.
: Not applicable.
: The authors declare that they have no competing interests.