De Castro, R. B., Cruz-Daylo, M. A. B., & Jardin, M. L. A. (2017). 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(1), 6–13. https://doi.org/10.32412/pjohns.v32i1.167