[1] Univ Penn, Dept Pediat, Perelman Sch Med, Philadelphia, PA 19104 USA
[2] Boston Childrens Hosp, Div Newborn Med, Dept Pediat, Boston, MA USA
[3] Harvard Med Sch, Boston, MA 02115 USA
[4] Washington Univ, Sch Med, St Louis, MO USA
[5] St Louis Childrens Hosp, St Louis, MO 63178 USA
[6] Joseph M Sanzari Childrens Hosp, Div Neonatol, Dept Pediat, Hackensack, NJ USA
[7] Hackensack Meridian Hlth Sch Med, Hackensack, NJ USA
[8] Nationwide Childrens Hosp, Columbus, OH USA
[9] Ohio State Univ, Coll Med, Columbus, OH 43210 USA
[10] New York Univ Grossman, Dept Pediat, Sch Med, New York, NY USA
[11] Univ Pittsburgh, Dept Pediat, Sch Med, Pittsburgh, PA USA
[12] Univ N Carolina, Dept Pediat, Sch Med, Chapel Hill, NC USA
[13] Johns Hopkins Univ, Dept Pediat, Sch Med, Baltimore, MD USA
[14] Case Western Reserve Univ, Rainbow Babies & Childrens Hosp, Dept Pediat, Sch Med, Cleveland, OH USA
[15] Baylor Coll Med, Div Neonatol, Houston, TX USA
[16] Vanderbilt Univ, Div Neonatol, Med Ctr, Nashville, TN USA
[17] Univ Missouri, Dept Pediat, Childrens Mercy Kansas City, Sch Med, Columbia, MO USA
[18] Univ Connecticut, Dept Pediat, Sch Med, Farmington, CT USA
[19] Connecticut Childrens, Div Neonatol, Hartford, CT 9 USA
[20] Yale Univ Sch Med, Dept Pediat, New Haven, CT USA
[21] Univ Rochester, Dept Pediat, Sch Med & Dent, Rochester, NY USA
[22] Univ Rochester, Dept Biomed Engn, Sch Med & Dent, Rochester, NY USA
[23] Univ Calif, David Geffen Sch Med, Div Neonatol & Dev Biol, Oakland, CA USA
[24] Univ Maryland, Dept Pediat, Sch Med, Baltimore, MD USA
[25] Univ Washington, Dept Pediat, Sch Med, Seattle, WA USA
[26] Duke Univ, Div Neonatol, Med Ctr, Durham, NC USA
[27] Indiana Univ, Dept Pediat, Sch Med, Indianapolis, IN USA
[28] West Virginia Univ, Dept Pediat, Sch Med, Morgantown, WV USA
[29] Northwestern Univ, Dept Pediat, Feinberg Sch Med, Evanston, IL USA
[30] Univ Baffalo, Div Neonatol, Dept Pediat, Buffalo, NY USA
[31] Univ Vermont, Dept Pediat, MD Coll Med, Robert Larner, Burlington, VT USA
[32] Univ Michigan Med Sch, Michigan Med, Dept Pediat, Ann Arbor, MI USA
[33] Univ Texas Hlth Sci Ctr San Antonio, Div Neonatol, San Antonio, TX USA
[34] Univ Wisconsin, Dept Pediat, Sch Hlth & Publ Hlth, Madison, WI USA