[1] Duke Univ, Sch Med, Dept Psychiat & Behav Sci, 2608 Erwin Dr,Suite 300, Durham, NC 27705 USA
[2] Duke Univ, Sch Med, Dept Populat Hlth Sci, 215 Morris St, Durham, NC 27701 USA
[3] Temple Univ, Dept Hlth & Rehabil Sci, 1700 N Broad St,Suite 300, Philadelphia, PA 19121 USA
[4] Duke Univ, Sch Med, Dept Pediat, 4020 N Roxboro St,Box 3675, Durham, NC 27710 USA
[5] Duke Univ, Duke Margolis Ctr Hlth Policy, 100 Fuqua Dr,Box 90120, Durham, NC 27708 USA
[6] George Washington Univ, Biostat Ctr, 6110 Execut Blvd, Rockville, MD 20852 USA
[7] Univ Chicago, NORC, 1 Broadway,14Th Floor, Cambridge, MA 02142 USA
[8] George Washington Univ, Milken Inst Sch Publ Hlth, Hlth Policy & Management, 950 New Hampshire Ave,6th Floor, Washington, DC 20052 USA