authors Kotagal, Vikas Bohnen, Nicolaas I Müller, Martijn L T M Koeppe, Robert A Frey, Kirk A Kenneth Langa, MD, PhD Albin, Roger L
has subject area Aged Cross-Sectional Studies Educational Status Female Gray Matter Humans Magnetic Resonance Imaging Male Middle Aged Parkinson Disease Positron-Emission Tomography Protective Factors Severity of Illness Index White Matter