1. Facultad de Medicina “Alberto Hurtado”; Universidad Peruana Cayetano Heredia; Lima Peru
2. Movement Disorders Clinic and the Edmond J. Safra Program in Parkinson's Disease; University Health Network, University of Toronto; Toronto Canada
3. Georgia Regents University; Department of Neurology; August, Georgia, USA; and Merz Pharmaceuticals; Raleigh North Carolina USA
4. Gardner Family Center for Parkinson's Disease and Movement Disorders; Department of Neurology; University of Cincinnati; Cincinnati Ohio USA