[1] Chang Gung Mem Hosp, Dept Neurol, Taipei 10591, Taiwan
[2] Chang Gung Univ, Coll Med, Taipei 10591, Taiwan
[3] NIA, Neurogenet Lab, Bethesda, MD 20892 USA
[4] UCL, Reta Lila Weston Inst Neurol Studies, London WC1N 1PJ, England
[5] NIA, Mol Genet Unit, NIH, Bethesda, MD 20892 USA