No funding support was provided for this Comment. Grants and contract support to SHF include funding from the Michael J Fox Foundation for Parkinson Research and the Edmond J Safra Foundation, the National Institutes of Health (US; Dystonia Coalition), Parkinson Canada, and the Parkinson Foundation (US). SHF reports honoraria for lectures paid to the institution from the International Parkinson and Movement Disorder Society, BIAL pharmaceutical company, and Lundbeck, consulting fees from Ipsen Pharmaceutical and Sunovion Pharmaceuticals; and SHF received royalties from Oxford University Press.