Vélez-Pastrana, Steven, et al. “Non-Fatal Opioid Overdose and Abuse Visits to a University Hospital Emergency Department in Puerto Rico, 2009-2018”. Puerto Rico Health Sciences Journal, vol. 42, no. 2, June 2023, pp. 111-20, https://prhsj.rcm.upr.edu/index.php/prhsj/article/view/2815.