[1] Univ Oklahoma, Dept Hlth & Exercise Sci, 1401 Asp Ave, Norman, OK 73019 USA
[2] Univ Michigan, Inst Social Res, Res Ctr Grp Dynam, Ann Arbor, MI 48109 USA
[3] Univ Michigan, Inst Healthcare Policy & Innovat, Ann Arbor, MI 48109 USA
[4] Univ Michigan, Child Hlth Evaluat & Res Ctr, Ann Arbor, MI 48109 USA
[5] VA Ann Arbor Healthcare Syst, Ctr Clin Management Res, Ann Arbor, MI USA
[6] Univ Michigan, Dept Internal Med, Ann Arbor, MI 48109 USA
[7] Univ Michigan, Dept Hlth Management & Policy, Ann Arbor, MI 48109 USA