Figure 1: Voice assessment based on; (a) Acoustic analysis in patients group at three times (before treatment, after treatment, and 6 months after treatment); (b) Persian VHI questionnaire in physical, emotional, functional subgroup and total at the over time; (c) GRBAS (G: Grade, R: Rough, B: Breathy, A: Asthenia, and S: Straining) scale in patients group in three evaluation times: (before, end, and 6 months after treatment). Abbreviation: HNR – Harmonic-to-noise ratio; NHR – Noise-to-harmonic ratio