David, M. J. C., G. M. Vicente, and A. H. Chua. “Pediatric Endoscopic Sinus Surgery in a Tertiary Government Hospital: Patient Profile and Surgical Indications”. Philippine Journal of Otolaryngology Head and Neck Surgery, vol. 24, no. 1, June 2009, pp. 13-17, doi:10.32412/pjohns.v24i1.705.