Chen, Jianhua, Hwa-Gan Chang, Mark Hammer, Nicole D’Anna, and Kitty Gelberg. “Using Scan Statistic to Detect Heroin Overdose Clusters With Hospital Emergency Room Visit Data”. Online Journal of Public Health Informatics 10, no. 1 (May 22, 2018). Accessed April 16, 2024. https://ojphi.org/ojs/index.php/ojphi/article/view/8344.