[1] NINDS, Surg Neurol Branch, NIH, Bldg 36,Rm 4D04, Bethesda, MD 20892 USA
[2] NINDS, Div Clin Res, NIH, Bldg 36,Rm 4D04, Bethesda, MD 20892 USA
[3] NINDS, Off Clin Director, NIH, Bldg 36,Rm 4D04, Bethesda, MD 20892 USA
[4] NIH, Radiol & Imaging Sci, Clin Ctr, Bldg 10, Bethesda, MD 20892 USA
[5] NIH, Positron Emiss Tomog Dept, Clin Ctr, Bldg 10, Bethesda, MD 20892 USA
[6] NINDS, Parkinsons Dis Clin, Off Clin Director, NIH, Bldg 36,Rm 4D04, Bethesda, MD 20892 USA
[7] NINDS, Clin Trials Unit, NIH, Bldg 36,Rm 4D04, Bethesda, MD 20892 USA
[8] Univ Calif Irvine, Dept Neurol, Irvine, CA 92717 USA
[9] NINDS, Human Motor Control Sect, Med Neurol Branch, NIH, Bldg 36,Rm 4D04, Bethesda, MD 20892 USA
[10] Ohio State Univ, Wexner Med Ctr, Dept Neurol Surg, Columbus, OH 43210 USA
[11] Univ Calif San Francisco, Dept Neurol Surg, San Francisco, CA USA