[1] Dana Farber Harvard Canc Care, Boston, MA USA
[2] Childrens Hosp, Boston, MA 02115 USA
[3] Univ Calif San Francisco, Childrens Hosp, San Francisco, CA 94143 USA
[4] St Anna Childrens Hosp, Childrens Canc Res Inst, Vienna, Austria
[5] Rikshosp Univ Hosp, Sect Paediat Surg, Div Surg, Oslo, Norway
[6] Inst Canc Res, Sutton, Surrey, England
[7] Royal Marsden Hosp, Sutton, Surrey, England
[8] Univ Chicago, Pritzker Sch Med, Chicago, IL 60637 USA
[9] Hosp La Fe, Pediat Oncol Unit, E-46009 Valencia, Spain