[1] Boston Univ, Sch Med, Genet Program L320, Dept Med, Boston, MA 02118 USA
[2] Boston Univ, Sch Med, Dept Neurol, Boston, MA 02118 USA
[3] Mayo Clin, Dept Neurol, Jacksonville, FL 32224 USA
[4] Mayo Clin, Dept Neurosci, Jacksonville, FL 32224 USA
[5] Mayo Clin, Dept Family Practice, Jacksonville, FL 32224 USA
[6] Boston Univ, Sch Publ Hlth, Dept Epidemiol & Biostat, Boston, MA USA
[7] Univ Alabama, Dept Epidemiol, Birmingham, AL USA
[8] Morehouse Sch Med, Dept Pharmacol, Atlanta, GA 30310 USA
[9] Morehouse Sch Med, Dept Med, Atlanta, GA 30310 USA
[10] Med Univ S Carolina, Dept Neurol, Charleston, SC 29425 USA
[11] Vanderbilt Univ, Sch Med, Program Human Genet, Nashville, TN 37212 USA