Dr. Chang is a Yale and Duke trained, board-certified otolaryngology-head and neck surgeon with fellowship training in laryngology. He is considered an expert on spasmodic dysphonia and has patients coming from as far as the Philippines (yes... the one on the other side of the world) every 3-6 months to receive treatment for this rare condition.
Read more about this condition here.
Books on voice therapy that MIGHT be a useful ADJUNCT to botox injections:
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