scientific article
author: Bruno Dubois, Günther Deuschl, Inga Liepelt-Scarfone, Irene Litvan, Glenda Halliday, Anthony Lang, Thomas Gasser, Werner Poewe, Bas Bloem, Daniela Berg, Wolfgang H. Oertel, Christopher G. Goetz, Charles H. Adler, Charles Warren Olanow, Matthew B. Stern, Kenneth Marek, Ronald B Postuma, Piu Chan, Jose A. Obeso
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