[1] Harvard TH Chan Sch Publ Hlth, Dept Hlth Policy & Management, Hlth Policy & Management, Boston, MA 02115 USA
[2] Brigham & Womens Hosp, 75 Francis St, Boston, MA 02115 USA
[3] Harvard TH Chan Sch Publ Hlth, Dept Hlth Policy & Management, Boston, MA USA
[4] Harvard Med Sch, Dept Hlth Care Policy, Hlth Econ, Boston, MA 02115 USA