[1] Duke Univ, Neurol, Durham, NC USA
[2] Duke Clin Rsch Inst, Hlth Serv Rsch, Durham, NC USA
[3] Duke Univ, Biostat & Bioinformat, Durham, NC USA
[4] Duke Univ, Med, Durham, NC USA
[5] Massachusetts Gen Hosp, Neurol, Boston, MA 02114 USA
[6] Univ Calgary, Neurol, Calgary, AB, Canada
[7] Univ Calif Los Angeles, Cardiol, Los Angeles, CA USA
[8] Brigham & Womens Hosp, Cardiovasc Med, 75 Francis St, Boston, MA 02115 USA
[9] Duke Univ, Cardiol, Durham, NC USA