[1] Univ N Carolina, Chapel Hill, NC 27515 USA
[2] Univ Calif Davis, Davis, CA 95616 USA
[3] Univ Calif Berkeley, Berkeley, CA 94720 USA
[4] Texas A&M Univ, College Stn, TX 77843 USA
[5] Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA
[6] N Carolina State Univ, Raleigh, NC 27695 USA
[7] Univ Lancaster, Lancaster LA1 4YW, England
[8] NIAID, Bethesda, MD 20892 USA
[9] Johns Hopkins Univ, Baltimore, MD 21218 USA
[10] Univ Michigan, Ann Arbor, MI 48109 USA
[11] Univ Ghent, Ghent, Belgium