[1] CDC, Atlanta, GA 30333 USA
[2] Emory Univ, Atlanta, GA 30322 USA
[3] Howard Univ, Washington, DC 20059 USA
[4] Sinai Hosp, Detroit, MI 48235 USA
[5] Vanderbilt Univ, Nashville, TN USA
[6] Hosp Univ Penn, Philadelphia, PA 19104 USA
[7] Stanford Univ, Stanford, CA 94305 USA
[8] Case Western Reserve Univ, Cleveland, OH 44106 USA
[9] Indiana Univ, Indianapolis, IN 46204 USA
[10] Univ Texas, Galveston, TX 77555 USA