https://www.ninds.nih.gov/Disorders/All-Disorders/Parkinsons-Disease-Information-Page

Parkinson’s disease information from the National Institute of Neurological Diseases and Stroke (NINDS).

http://parkinson.org/

Parkinson’s Disease Foundation.

https://www.ninds.nih.gov/Disorders/All-Disorders/Alzheimers-Disease-Information-Page

Alzheimer’s disease information from NINDS.

https://www.alz.org/

National Alzheimer’s Association.

https://www.ninds.nih.gov/Disorders/All-Disorders/Huntingtons-Disease-Information-Page

Huntington’s disease information from NINDS.

http://hdsa.org/

Huntington’s Disease Association of America.

https://www.ninds.nih.gov/Disorders/All-Disorders/Amyotrophic-Lateral-Sclerosis-ALS-Information-Page

Amyotrophic lateral sclerosis information from NINDS.

http://www.alsa.org/

ALS association.

https://www.ninds.nih.gov/Disorders/All-Disorders/Multiple-Sclerosis-Information-Page

Multiple sclerosis information from NINDS.

https://www.nationalmssociety.org/

National Multiple Sclerosis Society.