Serum uric acid level and its association with motor subtypes and non-motor symptoms in early Parkinson's disease: PALS study

The Hospital Anxiety and Depression Scale

A. S. Zigmond, R. P. Snaith · Acta Psychiatrica Scandinavica · 1983 · 46.6K citations

Social Sciences, Psychiatry, Psychology +13

The Pittsburgh sleep quality index: A new instrument for psychiatric practice and research

Daniel J. Buysse, Charles F. Reynolds, T. H. Monk et al. · Psychiatry Research · 1989 · 34.7K citations

Medicine, Psychiatry, Psychology +16

Reliability, validity, and clinical correlates of apathy in Parkinson's disease

S E Starkstein, H S Mayberg, Thomas J. Preziosi et al. · Journal of Neuropsychiatry · 1992 · 1.2K citations

Medicine, Neurology, Neuroscience +17

Alterations in glutathione levels in Parkinson's disease and other neurodegenerative disorders affecting basal ganglia

Jeswinder Sian, David T. Dexter, Andrew J. Lees et al. · Annals of Neurology · 1994 · 1.2K citations

Life Sciences, Neurology, Neuroscience +17

Increased Nigral Iron Content and Alterations in Other Metal Ions Occurring in Brain in Parkinson's Disease

David T. Dexter, F. R. Wells, Alyssa Lee et al. · Journal of Neurochemistry · 1989 · 1.1K citations

Life Sciences, Neurology, Neuroscience +9