Dealino, M. A., and A. P. Dela Cruz. “Dysphonia in Smokers of Combustible Cigarettes and E-Cigarettes Measured Using the Filipino Voice Handicap Index”. Philippine Journal of Otolaryngology Head and Neck Surgery, vol. 37, no. 1, June 2022, p. 27, doi:10.32412/pjohns.v37i1.1721.