[1] Cincinnati Childrens Hosp, Dept Pediat, Cincinnati, OH USA
[2] Univ Cincinnati, Cincinnati, OH USA
[3] Duke Univ, Sch Med, Dept Med, Div Metab Endocrinol & Nutr, Durham, NC 27706 USA
[4] Durham VA Med Ctr, Durham, NC USA
[5] Kings Coll Hosp London, Dept Child Hlth, London, England
[6] Kings Coll London, GKT Sch Med Educ, London WC2R 2LS, England
[7] Kings Coll Hosp London, Dept Pediat Surg, London, England
[8] Cincinnati Childrens Hosp, Dept Surg, Cincinnati, OH USA