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机译:
Univ Sao Paulo, Dept Ophthalmol Otorhinolaryngol Head & Neck Surg, Ribeirao Preto Med Sch, Av;
Univ Sao Paulo, Mus Dept, Fac Philosophy Sci & Letters Ribeirao Preto, Ribeirao Preto, SP, Brazil;
Singing voice; Acoustic analysis; Voice quality; Voice fatigue; Fundamental frequency;