[1] Childrens Hosp Boston, Div Dev Med, Boston, MA 02115 USA
[2] Childrens Hosp Boston, Div Adolescent Young Adult Med, Boston, MA 02115 USA
[3] Childrens Hosp Boston, Ctr Adolescent Substance Abuse Res, Boston, MA 02115 USA
[4] Harvard Univ, Sch Med, Dept Pediat, Boston, MA 02115 USA
[5] Ctr Evaluat Prevent & Res Subst Abuse, Prague, Czech Republic
[6] Prague Psychiat Ctr, Prague, Czech Republic
[7] Charles Univ Prague, Fac Humanities, Prague, Czech Republic
[8] Brandeis Univ, Heller Sch Social Policy & Management, Inst Behav Hlth, Waltham, MA USA
[9] Concord Hosp, Family Hlth Ctr, Concord, NH USA
[10] Cambridge Hlth Alliance, Dept Pediat, Cambridge, MA USA
[11] Cambridge Rindge & Latin High Sch, Teen Hlth Ctr, Cambridge, MA USA
[12] Somerville High Sch, Teen Hlth Ctr, Somerville, MA USA
[13] Cambridge Hlth Ctr, Family Practice Associates, Cambridge, VT USA
[14] Reliant Med Grp Inc, Dept Pediat, Worcester, MA USA
[15] Floating Hosp Children, Tufts Med Ctr, Dept Pediat, Boston, MA USA
[16] Dartmouth Hitchcock Concord, Concord, NH USA