[1] Univ Georgia, Dept Psychol, Athens, GA 30602 USA
[2] Univ Rochester, Med Ctr, Rochester, NY 14627 USA
[3] Childrens Hosp Boston, Dept Anesthesiol Perioperat & Pain Med, Div Pain Med, Boston, MA USA
[4] Harvard Univ, Sch Med, Dept Psychiat, Cambridge, MA 02138 USA
[5] Emory Univ Childrens Healthcare Atlanta, Atlanta, GA USA