[1] Univ Basel, Childrens Hosp, Basel, Switzerland
[2] Univ Adelaide, Dept Paediat, Adelaide, SA, Australia
[3] Swedish Inst Infect Dis Control, Lund, Sweden
[4] Natl Inst Publ Hlth & Environm, NL-3720 BA Bilthoven, Netherlands
[5] Univ Calif Davis, Med Ctr, Sacramento, CA 95817 USA
[6] US FDA, Rockville, MD 20857 USA
[7] Univ Sao Paulo, Sch Med, Sao Paulo, Brazil
[8] Univ Washington, Seattle, WA 98195 USA
[9] Dalhousie Univ, Halifax, NS, Canada
[10] Jordan Univ Hosp, Amman, Jordan
[11] Cedars Sinai Med Ctr, Los Angeles, CA 90048 USA
[12] Natl Inst Publ Hlth, Oslo, Norway
[13] Ctr Dis Control & Prevent, Atlanta, GA USA