[1] Univ Tennessee, Lebonheur Childrens Med Ctr, Memphis, TN 38103 USA
[2] Childrens Fdn Res Ctr, Memphis, TN USA
[3] Univ Rochester, Rochester, NY USA
[4] Univ Alabama, Birmingham, AL USA
[5] Univ Texas, SW Med Ctr Dallas, Dallas, TX 75235 USA
[6] Childrens Natl Med Ctr, Washington, DC 20010 USA
[7] Univ Washington, Seattle, WA 98195 USA
[8] Yale Univ, New Haven, CT USA
[9] Univ Chicago, Chicago, IL 60637 USA
[10] MedImmune, Gaithersburg, MD USA