[1] Ctr Dis Control & Prevent, Atlanta, GA 30333 USA
[2] Brigham & Womens Hosp, Dept Neurol, Div Neuromuscular Dis, Boston, MA 02115 USA
[3] Harvard Univ, Sch Med, Dept Ambulatory Care & Prevent, Boston, MA USA
[4] NCK Kaiser Permanente, Oakland, CA USA
[5] US FDA, Rockville, MD 20857 USA
[6] Johns Hopkins Univ, Sch Med, Baltimore, MD USA
[7] GlaxoSmithKline Biol, Rixensart, Belgium
[8] Vanderbilt Univ, Sch Med, Nashville, TN 37212 USA
[9] Univ Childrens Hosp, Basel, Switzerland
[10] Kings Coll London, Sch Med, London WC2R 2LS, England
[11] Jordan Univ Hosp, Amman, Jordan
[12] Univ Hosp Freiburg, Freiburg, Germany
[13] Publ Hlth Agcy Canada, Ottawa, ON, Canada
[14] Sanofi Pasteur MSD GmbH, Walldorf, Germany
[15] Hellen Ctr Dis Control & Prevent, Athens, Greece
[16] USAF, Airforce Reserve Command, Sturgeon Bay, WI USA
[17] Univ Hosp, New Jersey Med Sch, Morris Plains, NJ USA
[18] Vanderbilt Univ, Med Ctr, Nashville, TN USA
[19] Harvard Pilgrim Hlth Care, Boston, MA USA
[20] Natl Inst Publ Hlth & Environm, NL-3720 BA Bilthoven, Netherlands
[21] Univ Hosp Cleveland, Dept Neurol, Cleveland, OH 44106 USA