Text and Data Mining valid from 2019-12-01
Received: 13 September 2019
Accepted: 8 December 2019
First Online: 21 December 2019
Ethics approval and consent to participate
: This study was determined to be nonregulated by the University of Michigan institutional review board (HUM00061865) because only deidentified data were used. Therefore, the need for consent was not required for this study, however in the original data collection (see [CitationRef removed] for more details), entry screeners obtained consent verbally (as illiteracy is high). Deidentified data was shared with the authors as part of an ongoing collaboration between JH, RM, and MCE with the CDC and its partners. However, CDC and its partners retain ownership of the data and approved its use in publication.
: Not Applicable.
: The authors declare that they have no competing interests.