WILLIAM KOLLER, MD: Parkinson disease is clinical symptoms consisting of slowness, that is slowness of movement, stiffness of the muscles,...

ANNOUNCER: Muhammed Ali has it. Actor Michael J. Fox has it. Like one million other Americans, they both suffer from Parkinson disease, a life long...

ANNOUNCER: A stroke is always devastating but it is not necessarily fatal. THOMAS KWIATKOWSKI, MD: About half of all patients who have a stroke...