1. Department of Neurology; Methodist Neurological Institute; Houston TX
2. Department of Neurology; Henry Ford Hospital and Wayne State University; West Bloomfield MI
3. Department of Neurology; University of Kansas; Kansas City KS
4. Parkinson's Disease and Movement Disorders Center; Beth Israel Deaconess Medical Center; Harvard Medical School; Boston MA
5. Department of Neurology; The University of South Florida; Tampa FL
6. Department of Neurology; Southern Illinois University School of Medicine; Springfield IL