Movement disorders sourcebook : basic consumer health information about the symptoms and causes of movement disorders, including Parkinson disease, amyotrophic lateral sclerosis, cerebral palsy, muscular dystrophy, multiple sclerosis, myasthenia, myoclonus, spina bifida, dystonia, essential tremor, choreatic disorders, Huntington disease, Tourette syndrome, and other disorders that cause slowed, absent, or excessive movements ; along with information about surgical and nonsurgical interventions, physical therapies, strategies for independent living, clinical trials, a glossary of related terms, and a directory of resources for additional help and information.