[1] Duke Univ, Dept Psychol & Neurosci, Durham, NC 27706 USA
[2] Duke Univ, Dept Psychiat & Behav Sci, Durham, NC 27706 USA
[3] Kings Coll London, Inst Psychiat, London, England
[4] Dunedin Sch Med, Dunedin Multidisciplinary Hlth & Dev Res Unit, Dunedin, New Zealand