[1] Univ Michigan, Dept Internal Med, Sch Med, Ann Arbor, MI USA
[2] Univ Michigan, Inst Healthcare Policy & Innovat, 2800 Plymouth Rd, Ann Arbor, MI 48109 USA
[3] Vanderbilt Univ Sch Med, Dept Hlth Policy, Nashville, TN USA
[4] Univ Pittsburgh, Sch Publ Hlth, Dept Hlth Policy & Management, Pittsburgh, PA 15213 USA
[5] Weill Cornell Med, Dept Populat Hlth Sci, New York, NY USA
[6] Harvard Med Sch, Dept Hlth Care Policy, Boston, MA 02115 USA