[1] Univ Penn, Dept Psychiat, Sch Med, Philadelphia, PA 19104 USA
[2] Brown Univ, Sch Med, Dept Psychiat & Human Behav, Providence, RI 02912 USA
[3] Ctr Child & Adolescent Mental Hlth, Oslo, Norway
[4] Kings Coll London, Inst Psychiat, London WC2R 2LS, England
[5] Maudsley Hosp & Inst Psychiat, Natl & Specialist OCD Clin Young People, London SE5 8AZ, England
[6] McGill Univ, Ctr Hlth, Dept Psychol, OCD Clin, Montreal, PQ, Canada
[7] McGill Univ, Dept Psychiat, Montreal, PQ, Canada
[8] Fordham Univ, Dept Psychol, Bronx, NY 10458 USA
[9] Univ S Florida, Dept Pediat, St Petersburg, FL 33701 USA
[10] Univ S Florida, Dept Psychiat & Neurosci, St Petersburg, FL 33701 USA
[11] Duke Univ, Med Ctr, Duke Clin Res Inst, Div Neurosci Med, Durham, NC USA