[1] Duke Univ, Med Ctr, Dept Psychiat & Behav Sci, Psychiat Box 3903, Durham, NC 27710 USA
[2] Duke Univ, Med Ctr, Dept Med, Durham, NC USA
[3] Duke Univ, Med Ctr, Duke Clin Res Inst, Durham, NC USA
[4] Duke Univ, Sanford Sch Publ Policy, Ctr Child & Family Policy, Durham, NC USA