[1] Ctr Dis Control & Prevent, Atlanta, GA 30333 USA
[2] Massachusetts State Lab Inst, Jamaica Plain, MA USA
[3] Def Adv Res Projects Agcy, Arlington, VA USA
[4] Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA
[5] Univ Vermont, Burlington, VT 05405 USA
[6] Brigham & Womens Hosp, Boston, MA 02115 USA