2. Johns DF, Rohrich RJ, Awada M. Velopharyngeal Incompetence: A Guide for Clinical Evaluation. Plastic Reconstruct Surg 2003; 112(7):1890–7.
3. Karnell MP, Linville RN, Edwards BA. Variations in velar position over time: a nasal videoendoscopic study. J Speech Hear Res 1988; 31: 417-24.
4. Croft CB, Shprintzen RJ, Rakoff SJ. Patterns of velophrayngeal valving in normal and cleft palate subjects: a multi-view videofluoroscopic and nasendoscopic study. Laryngoscope 1981; 91: 265-71.
5. Witzel MA, Posnick JC. Patterns and location of velopharyngeal valving problems: atypical findings on video nasopharyngoscopy. Craniofacial Treatment and Research Centre, Hospital for Sick Children, Toronto, Ontario. Cleft Palate J 1989; 26(1):63–7.
6. Manochiopinig S, Chuangsuwanich A, Taweepraditpol S. The nasoendoscopy study of velopharyngeal closure patterns in normal Thai volunteers. Siriraj Med J 2005;57(5):118–212.
7. Golding-Kushner KJ. Standardization for the reporting of nasopharyngoscopy and multi-view videofluoroscopy: a report from an international working group. Cleft Palate J 1990;27:337–347.
8. Elfatah MK, El-Anwar MW, Quriba AS. Early functional outcome of two surgical protocols used in the repair of complete unilateral cleft lip palate: a comparative study. Ann Ped Surg 2014;10(4):99–106.
9. Henningsson G, Isberg A. Comparison between multiview videofluoroscopy and asendoscopy of velopharyngeal movements. Cleft Palate Craniofac J 1991;28:413–7.
10. Hodgins N, Hoo C, McGee P, Hill C. A survey of assessment and management of velopharyngeal incompetence (VPI) in the UK and Ireland. J Plast Reconstr Aesthet Surg 2015;68:485–91.
11. Khami M, Tan S, Glicksman JT, Husein M. Incidence and risk factors of velopharyngeal insufficiency postadenotonsillectomy. Otolaryngol Head Neck Surg. 2015;153(6):1051–5.