Lamb, Emilie, Dave Trepanier, and Shandy Dearth. “Updates to the HL7 2.5.1 Implementation Guide for Syndromic Surveillance”. Online Journal of Public Health Informatics 11, no. 1 (May 30, 2019). Accessed November 27, 2021. https://ojphi.org/ojs/index.php/ojphi/article/view/9726.