| apdaparkinson.com | The American Parkinson's Disease Association Inc |
| parkinsonsdisease.com | Awakenings |
| gnu.org | GNU Free Documentation License |
| pdf.org | Parkinson s Disease Foundation (PDF) |
| parkinsons.org.uk | Parkinson's Disease Society |
| parkinson.org | National Parkinson Foundation, Inc. |
| michaeljfox.org | Michael J. Fox Foundation |
| apdama.org | APDA: The Massachusetts Chapter |
| parkinsons.org.uk | Special Parkinson's Research Interest Group |
| neurohub.net | Parkinson's Disease And Movement Disorders Center |
| harvard.edu | neuro-chief-e.mgh.harvard.edu/ |
United States , Arizona , Scottsdale