Funding for this research was provided by:
National Institute of Allergy and Infectious Diseases (AI094514)
Received: 8 June 2017
Accepted: 30 September 2018
First Online: 20 October 2018
Ethics approval and consent to participate
: All procedures were approved by the Pennsylvania State University, Institutional Review Board (protocol #36943). Participants provided written informed consent and were reimbursed for their time.
: Not applicable.
: The authors declare that they have no competing interests.
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