[1] NIA, Neurogenet Lab, NIH, Bethesda, MD 20892 USA
[2] UCL, Dept Mol Neurosci, London, England
[3] UCL, Inst Neurol, Reta Lila Weston Labs, London, England
[4] Univ Tubingen, Dept Neurodegenerat Dis, Hertie Inst Clin Brain Res, Tubingen, Germany
[5] NIEHS, Epidemiol Branch, Res Triangle Pk, NC 27709 USA
[6] Univ Marburg, Ctr Nervous Dis, Marburg, Germany
[7] Univ Hosp, Bonn Med Ctr, Dept Neurol, Bonn, Germany
[8] Ist Clin Perfezionamento, Parkinson Inst, Milan, Italy
[9] Univ Naples Federico II, Dept Neurol Sci, Naples, Italy
[10] Helmholtz Zentrum Munchen, German Res Ctr Environm Hlth, Inst Epidemiol, Munich, Germany
[11] Univ Tubingen, Inst Human Genet, Dept Med Genet, Tubingen, Germany
[12] Univ Florida, Dept Neurol & Neurosurg, Gainesville, FL USA
[13] Med Univ Innsbruck, Dept Neurol, Innsbruck, Austria