[1] Louisiana State Univ, Dept Pediat, Hlth Sci Ctr New Orleans, New Orleans, LA USA
[2] Louisiana State Univ, Sch Publ Hlth, Biostat Program, Hlth Sci Ctr New Orleans, New Orleans, LA USA
[3] Louisiana State Univ, Dept Pediat, Div Neonatol, Hlth Sci Ctr New Orleans, 200 Henry Clay Ave, New Orleans, LA 70118 USA