[1] Harvard Univ, Sch Publ Hlth, Dept Hlth Policy & Management, Boston, MA 02115 USA
[2] Harvard Univ, Sch Med, Dept Med, Boston, MA 02115 USA
[3] Harvard Univ, PhD Program Hlth Policy Management, Boston, MA 02115 USA
[4] Boston Childrens Hosp, Div Gen Pediat, Boston, MA USA
[5] Harvard Univ, Sch Med, Boston, MA USA
[6] Harvard Pilgrim Hlth Care Inst, Dept Populat Med, Boston, MA USA
[7] Allegheny Cty Hlth Dept, Pittsburgh, PA USA