Vivolo-Kantor, Alana M., R. Matthew Gladden, Aaron Kite-Powell, Michael Coletta, and Grant Baldwin. “Tracking Suspected Heroin Overdoses in CDC’s National Syndromic Surveillance Program”. Online Journal of Public Health Informatics 10, no. 1 (May 22, 2018). Accessed January 21, 2022. https://ojphi.org/ojs/index.php/ojphi/article/view/8982.