[1] Univ Texas SW Med Ctr Dallas, Dallas, TX 75390 USA
[2] Clin Trials & Surveys Corp, Owings Mills, MD USA
[3] Univ Mississippi, Jackson, MS 39216 USA
[4] Duke Univ, Med Ctr, Durham, NC USA
[5] Childrens Hosp Michigan, Detroit, MI 48201 USA
[6] Howard Univ, Washington, DC 20059 USA
[7] Childrens Natl Med Ctr, Washington, DC 20010 USA
[8] Med Univ S Carolina, Charleston, SC 29425 USA
[9] Univ Alabama, Birmingham, AL USA
[10] Johns Hopkins Univ, Sch Med, Baltimore, MD USA
[11] Emory Univ Childrens Healthcare Atlanta, Atlanta, GA USA
[12] Univ Miami, Sch Med, Miami, FL USA
[13] NHLBI, NIH, Bethesda, MD 20892 USA
[14] SUNY Brooklyn, Brooklyn, NY USA
[15] St Jude Childrens Hosp, Memphis, TN 38105 USA