[1] Univ Penn, Childrens Hosp Philadelphia, Dept Pediat, Perelman Sch Med,Div Neonatol, Philadelphia, PA 19104 USA
[2] Univ Texas Southwestern Med Ctr Dallas, Dept Pediat, Dallas, TX 75390 USA
[3] Phoenix Childrens Hosp, Dept Pediat, Phoenix, AZ USA
[4] Johns Hopkins Univ, Sch Med, Dept Anesthesiol & Crit Care Med, Baltimore, MD USA
[5] Univ Washington, Sch Med, Dept Pediat, Div Neonatol,Seattle Childrens Hosp, Seattle, WA 98195 USA
[6] Barbara Bush Childrens Hosp, Dept Pediat, Div Pediat Crit Care Med, Portland, ME USA
[7] Boston Childrens Hosp, Dept Cardiol, Boston, MA 02115 USA
[8] Harvard Med Sch, Dept Pediat, Boston, MA 02115 USA
[9] Ohio State Univ Med, Nationwide Childrens Hosp, Dept Pediat, Div Crit Care Med, Columbus, OH USA
[10] Stanford Univ, Dept Pediat Pediatr Crit Care Med, Palo Alto, CA 94304 USA
[11] Nationwide Childrens Hosp Columbus, Grant Morrow MD Med Lib 3, Columbus, OH USA
[12] Case Western Reserve Univ, Sch Med, Dept Pediat, Rainbow Babies & Childrens Hosp, Cleveland, OH 44106 USA