[1] Boston Childrens Hosp, Dept Pediat, Boston, MA 02215 USA
[2] Harvard Grad Sch Educ, Harvard Med Sch, Boston, MA 02115 USA
[3] Hosp Sick Children, Ctr Global Child Hlth, Toronto, ON, Canada
[4] Aga Khan Univ, Inst Global Hlth & Dev, Karachi, Pakistan
[5] State Calif, Sacramento, CA USA
[6] Kings Coll London, Inst Psychiat Psychol & Neurosci, London, England
[7] South London & Maudsley NHS Fdn Trust, Natl & Specialist CAMHS Clin Trauma Anxiety & Dep, London, England
[8] Kingston Univ London, Dept Psychol, London, England