Define the following abbreviation.

ALS ______

Amyotrophic Lateral Sclerosis

Give the abbreviation for the following definition.

cerebrovascular accident ______

CVA

Define the following abbreviation.

ADHD ______

Attention-Deficit Hyperactivity Disorder

Define the following abbreviation.

PET ______

Positron Emission Tomography

Give the abbreviation for the following definition.

central nervous system ______

CNS