How many people were include in the study population of neurodegenerative diseases

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Explanation:

Neurodegenerative diseases result from the gradual and progressive loss of neural cells, leading to nervous system dysfunction. According to the National Institute of Neurological Disorders and Stroke, there are more than 600 neurologic disorders, with approximately 50 million Americans affected each year.

Includes Diseases: Progressive supranuclear palsy...

Because neurodegenerative diseases strike primarily in mid- to late-life, the incidence is expected to soar as the population ages. (By 2030, as many as 1 in 5 Americans will be over the age of 65.) If left unchecked 30 years from now, more than 12 million Americans will suffer from neurodegenerative diseases.