[1] Scripps Res Inst, La Jolla, CA 92037 USA
[2] Harvard Med Sch, Boston, MA USA
[3] Univ Penn, Philadelphia, PA 19104 USA
[4] Emory Univ, Atlanta, GA 30322 USA
[5] Inst Human Virol, Baltimore, MD USA
[6] Univ Alabama, Birmingham, AL USA
[7] Santa Fe Inst, Santa Fe, NM 87501 USA
[8] Rush Med Coll, Chicago, IL 60612 USA
[9] Case Western Reserve Univ, Cleveland, OH 44106 USA
[10] Gladstone Inst Virol & Immunol, San Francisco, CA USA
[11] Cornell Univ, Weill Med Coll, New York, NY USA
[12] Oregon Hlth & Sci Univ, Portland, OR USA
[13] Univ Calif San Diego, San Diego, CA 92103 USA
[14] San Diego Vet Affairs Healthcare Syst, San Diego, CA USA
[15] Univ Pittsburgh, Pittsburgh, PA USA
[16] Univ Massachusetts, Sch Med, Worcester, MA USA
[17] Univ Wisconsin, Madison, WI USA
[18] Northwestern Univ, Chicago, IL 60611 USA
[19] Univ Calif Los Angeles, Los Angeles, CA USA