[1] Univ Washington, Dept Rehabil Med, Seattle, WA 98195 USA
[2] Seattle Childrens Res Inst, Ctr Child Hlth Behav & Dev, Seattle, WA USA
[3] Univ Washington, Dept Anesthesiol & Pain Med, Seattle, WA 98195 USA
[4] Childrens Mercy Hosp, Dept Dev & Behav Sci, Kansas City, MO 64108 USA
[5] Childrens Mercy Hosp, Dept Pain Management, Kansas City, MO 64108 USA
[6] Univ Washington, Dept Pediat, Seattle, WA 98195 USA
[7] Univ Washington, Dept Psychiat & Behav Sci, Seattle, WA 98195 USA