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Pramipexole vs levodopa as initial treatment for Parkinson disease: a 4-year randomized controlled trial.

John Seibyl, Mark Stacy, Stanley Fahn, 2004, Archives of neurology.

Pramipexole vs levodopa as initial treatment for Parkinson disease: A randomized controlled trial. Parkinson Study Group.

John Seibyl, Anthony E. Lang, Stanley Fahn, 2000, JAMA.