[1] Univ N Carolina, Chapel Hill, NC USA
[2] Univ Kansas, Lawrence, KS 66045 USA
[3] Univ Alabama, Sch Publ Hlth, Birmingham, AL 35294 USA
[4] Ohio State Univ, Columbus, OH 43210 USA
[5] Duke Univ, Durham, NC USA
[6] Univ Calif Irvine, Irvine, CA USA
[7] Brown Univ, Warren Alpert Med Sch, Providence, RI 02912 USA
[8] Univ Miami, Miami, FL USA
[9] So Gen Hosp, Inst Neurol Sci, Glasgow G51 4TF, Lanark, Scotland
[10] Univ Florida, Jacksonville, FL USA
[11] Shands Neurosci Inst, Jacksonville, FL USA
[12] Caritas St Elizabeths Med Ctr, Brighton, MA USA
[13] Johns Hopkins Univ, Sch Med, Baltimore, MD USA
[14] Wishard Mem Hosp, Indianapolis, IN USA
[15] Univ Alberta Hosp, Edmonton, AB, Canada