Funding for this research was provided by:
Centers for Disease Control and Prevention (Contract #200-2013-M-53964B)
Text and Data Mining valid from 2019-08-09
Received: 12 February 2019
Accepted: 10 June 2019
First Online: 9 August 2019
Ethics approval and consent to participate
: This study relied on published data. Individual patient data was not collected or analyzed. Therefore, no ethics approval or consent to participate was required.
: All authors reviewed the manuscript and consented to its publication.
: No authors, other than from RTI International, received funding for the study. The authors declare that they have no competing interests.