1-Bellia S, Serafino L, Luca N, Farruggia E, Bellia M. Incidence of dysphonia in teaching staff of schools. G Ital Med LavErgon. 2007; 29 (3): 613-14.
2-Jadim R. Case definition and prevalence in teachers. Rev Bras Epidemiol. 2007; 10 (4): 625-36
3-Crannel, K. Voice and Articulation. Wadsworth Publishing Company; 2000, USA.
4-Bouwers F, G. Dikkers F. A retrospective study concerning the psychosocial impact of voice disorders: Voice handicap index change in patients with benign voice disorders after treatment (measured with the Dutch version of the VHI). J Voice 2009; 23(2): 218-224.
5-Wilson J, Deary I, Millar A, Mackensie K. The quality of life impact of Dysphonia.Clin Otolaryngology 2002; 27: 179–182.
6-Yu P, Ouaknine M, Revis J, Giovanni A. Objective voice analysis for dysphonic patients: a multiparametric protocol including acoustic and aerodynamic measurements. J Voice 2001; 15(4): 529-42.
7-Brockmann M, Drinnan MJ, Storck C, Carding PN. Reliable jitter and shimmer measurements in voice clinics:the relevance of vowel, gender, vocal intensity, and fundamental frequency effects in a typical clinical task. J Voice 2011; 25(1): 44-53.
8-E.T. Doherty, Evaluation of selected acoustic parameters for use in speaker identification, J. Acoust. Soc. Am. 58 (S107) (1975) 1121.
9-M. Grellet, J.C. Pereira, M. Oliveira Rosa, Standardization of acoustic measures of the normal voice, Braz. J. Otorhinolaryngol. 68 (2002) 540–544.
10-Z. Yang, J. Fan, J. Tian, L. Liu, C. Gan, W. Chen, et al., Cepstral analysis in children with velopharyngeal insufficiency after cleft palate surgery, J. Voice 28 (2014) 789–792.
11-Ysunza A, Pamplona M, Molina F, Drucker M, Felemovicius J, Ramirez E, et al., Surgery for speech, Int. J. Pediatr. Otorhinolaryngol. 2004 ; 68 :1499–1505.
12-Pamplona M.C, Ysunza A, Morales S. Strategies for treating compensatory articulation in patients with cleft palate, Int. J. Biomed. Sci. 2014; 10 : 43–51.
13-Villafuerte-Gonzalez R.et al.Acoustic analysis of voice in children with cleft palate and velopharyngeal insufficiency. IntJPediatrOtorhinolaryngol . 2015; 79: 1073–1076
14- Hamming KK, Finkelstein M, Sidman JD. Hoarseness in children with cleft palate. Otolaryngol Head Neck Surg. 2009; 140(6): 902-6.
15-Van Lierde KM, Claeys S, De BM, Van CP. Vocal quality characteristics in children with cleft palate: a multiparameter approach. J Voice 2004; 18(3): 354-62.
16-Zajac DJ, Linville RN. Voice perturbations of children with perceived nasality and hoarseness. Cleft Palate J.1989; 26(3): 226-231.
17-Kummer AW. Cleft palate and craniofacial anomalies: effects on speech and resonance. 2nd ed. New York:Cengage Learning; 2008.
18-Mojiri F,etal.Compare acoustic analysis in children with VPI and normal. J Res RehabilSci 2012; 7(4):540-548
19-Tarlow AJ, Saxman JH. A comparative study of the speaking fundamental frequency characteristics in children with cleft palate. Cleft Palate J 1970; 7: 696-705.
20-Boone DR, MacFarlane SC, Von Berg SL, Zraick RI. The voice and voice therapy. 8th ed. New York: Allyn & Bacon; 2010.
21-Niedzielska G. Acoustic estimation of voice when incorrect resonance function of the nose takes place. Int J PediatrOtorhinolaryngol 2005; 69(8): 1065-9.
22-Behrman A. Speech and voice science. San Diego: Plural Pub; 2007.
23-L. Wanderley Lopes, S.L. Do Nascimento Cunha Costa, W.C. De Almeida Costa, S.E. Nobrega Correia, V.J. Dias Vieira, Acoustic assessment of the voices of children using nonlinear analysis: proposal for assessment and vocal monitoring, J. Voice 28 (2014) 565–573.
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