[1] Vagelos Coll Phys & Surg, Columbia Univ, Dept Pediat, Div Neonatol, New York, NY USA
[2] Yale Univ, Sch Med, Dept Pediat, Div Neonatal Perinatal Med, New Haven, CT USA
[3] Yale Univ, Sch Med, Program Biomed Eth, New Haven, CT USA
[4] Yale Univ, Sch Med, Dept Pediat, New Haven, CT USA
[5] Yale Univ, Sch Med, Dept Biostat, New Haven, CT USA
[6] Yale Univ, Sch Med, Dept Med, Sect Cardiol, New Haven, CT USA
[7] Columbia Univ, Vagelos Coll Phys & Surg, Dept Pediat, Div Neonatol, 622 W 168th St Suite PH17, New York, NY 10032 USA