Funding for this research was provided by:
National Institute of Dental and Craniofacial Research (R01 DE023113)
National Institute of Allergy and Infectious Diseases (R01 AI112401)
Received: 25 July 2018
Accepted: 25 November 2018
First Online: 17 December 2018
Ethics approval and consent to participate
: The study was approved by the Administrative Panels on Human Subjects Research (Stanford IRB protocol #21586) and by the Human Research Protection Program at UCSF (UCSF IRB protocol ##11-06283). All research subjects provided written informed consent prior to specimen collection.
: Not applicable.
: The authors declare that they have no competing interests.
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