[1] UCL, Dept Clin Educ & Hlth Psychol, London, England
[2] Birkbeck Univ London, Dept Psychol Sci, London, England
[3] Univ Oregon, Prevent Sci Inst, Eugene, OR 97403 USA
[4] George Washington Univ, Dept Psychol, Washington, DC 20052 USA
[5] Univ Calif Riverside, Dept Psychol, Riverside, CA 92521 USA
[6] Yale Sch Med, Yale Child Study Ctr, New Haven, CT USA
[7] Univ Pittsburgh, Dept Psychol, Pittsburgh, PA 15260 USA
[8] Penn State Univ, Dept Psychol, University Pk, PA 16802 USA