Member Webinars › Functional Voice Disorders: Diagnosis and Treatment Image 1 of 1 Functional Voice Disorders: Diagnosis and Treatment $0.00 Join Dr Alex Lehn and Dr Cath Gregory to learn about terminology in FND and FVD, myths, diagnosis and treatment principals. Add to Cart Added! Join Dr Alex Lehn and Dr Cath Gregory to learn about terminology in FND and FVD, myths, diagnosis and treatment principals.