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All underwent a thorough voice assessment (subjective, unbiased, and self-perceptual vocal measures) prior to and four weeks following the VHP. Inter-rater reliability for perceptual and aesthetic evaluation was projected using Intra-Class Coefficiehyper-adduction). V-DOP scores indicated positive change in the overall seriousness (P=0.002), physical (P=0.003) and useful domain (P=0.034). VFI indicated enhancement in teachers vocals over time of sound rest (P=0.048).