Patients will have 5 study visits; screening, 3, 6, 9 and 12 months. There will be a one year post-participation follow-up period, during which they will receive an email or phone call interview once every 3 months. During the first year, samples will be collected, breathing, muscle strength, spasticity, general function and cognitive behavior will be assessed. Healthy controls will have 2 study visits during which blood samples will be collected and questionnaires given.
