scientific article
author: Karl Kieburtz, Joel S Perlmutter, John G Nutt, Parkinson Study Group, Matthew B. Stern, M. Flint Beal, Roger Kurlan, Ira Shoulson, David Oakes, Stephen G. Reich, Jorge L Juncos, Mark F. Lew, Ray L. Watts, Clifford W. Shults
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