[1] Univ New Mexico, Hlth Sci Ctr, Albuquerque, NM 87131 USA
[2] Stanford Univ, Dept Pediat, Div Neonatal & Dev Med, Palo Alto, CA 94304 USA
[3] Lucile Packard Childrens Hosp, Palo Alto, CA USA
[4] RTI Int, Social Stat & Environm Sci Unit, Res Triangle Pk, NC USA
[5] Brown Univ, Women & Infants Hosp, Dept Pediat, Providence, RI 02908 USA
[6] Univ Denver, Dept Psychol, Denver, CO 80208 USA
[7] Univ Calif Irvine, Inst Interdisciplinary Salivary Biosci Res, Irvine, CA USA
[8] Wayne State Univ, Dept Pediat, Detroit, MI 48202 USA
[9] Case Western Reserve Univ, Rainbow Babies & Childrens Hosp, Dept Pediat, Cleveland, OH 44106 USA
[10] Eunice Kennedy Shriver Natl Inst Child Hlth & Hum, NIH, Bethesda, MD USA
[11] Univ Cincinnati, Cincinnati, OH 45221 USA
[12] Univ Chicago, Pritzker Sch Med, Chicago, IL 60637 USA
[13] Columbia Univ, Coll Phys & Surg, Div Neonatol, New York, NY 10027 USA
[14] Brown Univ, Alpert Med Sch, Providence, RI 02912 USA
[15] Women & Infants Hosp Rhode Isl, Providence, RI 02908 USA
[16] Case Western Reserve Univ, Rainbow Babies & Childrens Hosp, Cleveland, OH 44106 USA
[17] Duke Univ, Sch Med, Univ Hosp, Durham, NC 27706 USA
[18] Duke Reg Hosp, Durham, NC USA
[19] Emory Univ, Grady Mem Hosp, Childrens Healthcare Atlanta, Atlanta, GA 30322 USA
[20] Emory Crawford Long Hosp, Atlanta, GA USA
[21] Eunice Kennedy Shriver Natl Inst Child Hlth & Hum, Bethesda, MD USA
[22] Indiana Univ, Univ Hosp, Methodist Hosp, Riley Hosp Children, Bloomington, IN 47405 USA
[23] Wishard Hlth Serv, Indianapolis, IN USA
[24] Univ Texas Hlth Sci Ctr Houston, McGovern Med Sch, Houston, TX 77030 USA
[25] Childrens Mem Hermann Hosp, Houston, TX USA
[26] NHLBI, Bldg 10, Bethesda, MD 20892 USA
[27] RTI Int, Res Triangle Pk, NC USA
[28] Stanford Univ, Stanford, CA 94305 USA
[29] Floating Hosp Children, Tufts Med Ctr, Boston, MA USA
[30] Univ Alabama Birmingham Hlth Syst, Birmingham, AL USA
[31] Childrens Hosp Alabama, Birmingham, AL USA
[32] Univ Calif San Diego, Med Ctr, La Jolla, CA 92093 USA
[33] Sharp Mary Birch Hosp Women, San Diego, CA USA
[34] Univ Iowa, Iowa City, IA 52242 USA
[35] Univ Texas Southwestern Med Ctr Dallas, Parkland Hlth & Hosp Syst, Dallas, TX 75390 USA
[36] Childrens Med Ctr Dallas, Dallas, TX USA
[37] Univ Utah, Med Ctr, Intermt Med Ctr, LDS Hosp, Salt Lake City, UT 84112 USA
[38] Primary Childrens Med Ctr, Salt Lake City, UT 84103 USA
[39] Wayne State Univ, Hutzel Womens Hosp, Detroit, MI 48202 USA
[40] Childrens Hosp Michigan, Detroit, MI 48201 USA