Effect of Semi-occluded Vocal Tract Therapy on the Phonation of Children With Vocal Fold Nodules

The goal of this clinical trial is to determine and compare the effects of different voice therapy programs in children with vocal fold nodules. Vocal fold nodules are non-cancerous growths on the vocal folds which cause hoarseness. The main questions this trial aims to answer are: * What are the short-term effects of the new voice therapy program 'straw phonation' and a more traditional 'resonant voice therapy' program on (a) the vocal quality, (b) the size of the growths on the vocal folds, and (c) the overall functioning in children with vocal fold nodules? During straw phonation exercises, you make sound through a drinking straw. During resonant voice therapy exercises or 'humming', you make an 'm' sound as you breathe out. * What are the long-term effects of these voice therapy programs? Participants will receive a short-term intensive voice therapy program of four days. The researchers will compare the straw phonation group, resonant voice therapy group and control group to see if voice therapy works well in treating children with vocal fold nodules. The researchers hypothesize that straw phonation will have better results than resonant voice therapy. Straw phonation exercises are easier for children because they use an external tool (the straw) and less self-correction is needed.