[1] Univ Oxford, Wellcome Trust Ctr Human Genet, Oxford OX3 7BN, England
[2] Cornell Univ, Ithaca, NY USA
[3] Univ Oxford, St Johns Coll, Oxford, England
[4] Tech Univ Dresden, Dept Neurol, D-8027 Dresden, Germany
[5] Vinznez Paul Hosp Rottemunster, Dept Neurol, Rottweil, Germany
[6] Ipswich Hosp, Dept Clin Neurol, Ipswich, Suffolk, England
[7] Univ Groningen Hosp, Groningen, Netherlands
[8] Univ Toronto, Div Neurol, Toronto, ON, Canada
[9] Univ Siena, Dept Neurobiol & Behav Sci, Sect Neurol & Neurometab Dis, Sch Med, I-53100 Siena, Italy
[10] NHLBI, CardiovascBranch, Bethesda, MD 20892 USA
[11] Bristol Inst Transfus Sci, Bristol, Avon, England
[12] Univ Munich, Neurol Klin, Munich, Germany