[1] Univ Bath, Ctr Pain Res, Bath BA2 7AY, Avon, England
[2] Univ Washington, Seattle, WA 98195 USA
[3] UCL, Res Dept Clin Educ & Hlth Psychol, London, England
[4] Childrens Hosp, Div Psychol, Boston, MA 02115 USA
[5] Univ Leeds, Leeds Inst Hlth Sci, Leeds, W Yorkshire, England
[6] Univ Bath, Dept Hlth, Bath BA2 7AY, Avon, England
[7] Seattle Childrens Res Inst, Seattle, WA USA