[1] Univ Michigan, Dept Hlth Management & Policy, Ann Arbor, MI 48109 USA
[2] Univ Michigan, Dept Econ, Ann Arbor, MI 48109 USA
[3] Natl Bur Econ Res, Cambridge, MA 02138 USA
[4] Mt Sinai, Dept Hlth Evidence & Policy, Icahn Sch Med, New York, NY USA
[5] Mt Sinai, Dept Pediat, Icahn Sch Med, New York, NY USA