Ortiz, A. P., Díaz-Toro, E. C., Calo, W. A., Correa-Fernández, V., Cases, A., Santos-Ortiz, M. C., … Wetter, D. W. (2008). Characteristics of smokers accessing the Puerto Rico Quitline. Puerto Rico Health Sciences Journal, 27(3). Retrieved from https://prhsj.rcm.upr.edu/index.php/prhsj/article/view/71