[1] Univ Alabama Birmingham, Dept Pediat, Div Pediat Crit Care Med, Birmingham, AL 35233 USA
[2] Univ Alabama Birmingham, Dept Pediat, Pediat Residency Program, Birmingham, AL USA
[3] Univ Alabama Birmingham, Heersink Sch Med, Birmingham, AL USA
[4] Univ Alabama, Tuscaloosa, AL USA
[5] Childrens Alabama, Performance Improvement & Accreditat Dept, Birmingham, AL USA
[6] Univ Alabama Birmingham, Lister Hill Ctr Hlth Policy, Sch Publ Hlth, Birmingham, AL USA