De Castro, Roderick B., Michelle Angelica B. Cruz-Daylo, and Monique Lucia A. Jardin. “Low Frequency Ultrasound in Chronic Rhinosinusitis With Nasal Polyposis and Recovery After Endoscopic Sinus Surgery: A Randomized Controlled Trial”. Philippine Journal of Otolaryngology Head and Neck Surgery 32, no. 1 (June 29, 2017): 6–13. Accessed April 28, 2024. https://pjohns.pso-hns.org/index.php/pjohns/article/view/167.