REFERENCES
- Jacobson , B , Johnson , A , Grywalski , C , Silbergleit , A , Jacobson , G Benninger , M . 1997 . The Voice Handicap Index (VHI): Development and validation . American Journal of Speech-Language Pathology , 6 : 66 – 70 .
- Ramig , LO , Countryman , S , O'Brien , C , Hoehn , MM and Thompson , L . 1996 . Intensive speech treatment for patients with Parkinson's disease: Short and long-term comparison of two techniques . Neurology , 47 : 1496 – 1504 .
- Ramig , LO , Sapir , S , Fox , CM and Countryman , S . 2001 . Changes in vocal loudness following intensive voice treatment (LSVT) in individuals with Parkinson's disease: A comparison with untreated patients and normal aged-matched controls . Movement Disorders , 16 : 79 – 83 .
- Spielman , J , Ramig , LO , Mahler , L , Halpern , A and Gavin , WJ . 2007 . Effects of an extended version of the Lee Silverman Voice Treatment on voice and speech in Parkinson's disease . American Journal of Speech-Language Pathology , 16 : 95 – 107 .