[1] Dalhousie Univ, Dept Psychol & Neurosci, Halifax, NS B3H 3J5, Canada
[2] IWK Hlth Ctr, Ctr Pediat Pain Res, Halifax, NS B3K 6R8, Canada
[3] Seattle Childrens Res Inst, Ctr Child Hlth Behav & Dev, Seattle, WA USA
[4] Dalhousie Univ, Dept Pediat, Halifax, NS B3H 3J5, Canada
[5] IWK Hlth Ctr, Mental Hlth Serv, Halifax, NS B3K 6R8, Canada
[6] IWK Hlth Ctr, Addict Serv, Halifax, NS B3K 6R8, Canada
[7] Univ Queensland, Sch Populat Hlth, Brisbane, Qld 4072, Australia