[1] Univ Texas, SW Med Sch, Dept Internal Med, Dallas, TX 75230 USA
[2] NHLBI, Div Lung Dis, Bethesda, MD 20892 USA
[3] Univ So Calif, Childrens Hosp Los Angeles, Res Inst, Los Angeles, CA 90089 USA
[4] Univ Virginia, Charlottesville, VA USA
[5] Harvard Univ, Childrens Hosp, Dept Surg, Boston, MA 02115 USA
[6] Georgetown Univ, Sch Med, Lung Biol Lab, Washington, DC USA
[7] Univ New Mexico, Albuquerque, NM 87131 USA
[8] Washington Univ, Dept Med, St Louis, MO USA
[9] Penn State Univ, Hershey, PA USA
[10] SUNY Buffalo, Div Neonatol, Buffalo, NY 14260 USA
[11] Indiana Univ, Sch Med, Dept Pediat, Indianapolis, IN 46204 USA
[12] Univ S Alabama, Dept Physiol, Mobile, AL 36688 USA
[13] Univ N Carolina, Chapel Hill, NC 27515 USA
[14] Harvard Univ, Sch Publ Hlth, Boston, MA 02115 USA