scientific article
author: Anthony Lang, Connie Fernández-Cid Marras, Michael A Schwarzschild, Stanley Fahn, Karl Kieburtz, Alberto Ascherio, Caroline M Tanner, M. Flint Beal, Shirley Eberly, Alice Rudolph, Steven R Schwid, Ira Shoulson, Parkinson Study Group DATATOP Investigators, David Oakes, Peter A. Lewitt
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