Marín, H. A., & Díaz-Toro, E. C. (2011). Reduced Exposure to Secondhand Smoke at Casinos in Puerto Rico after the Implementation of a Workplace Smoking Ban in 2007: a Pre-Post Design. Puerto Rico Health Sciences Journal, 30(4). Retrieved from https://prhsj.rcm.upr.edu/index.php/prhsj/article/view/604