[1] H Lee Moffitt Canc Ctr & Res Inst, Tampa, FL USA
[2] Mayo Clin, N Cent Canc Treatment Grp, Rochester, MN USA
[3] Radiat Therapy Oncol Grp, Philadelphia, PA USA
[4] Natl Surg Adjuvant Breast & Bowel Project, Pittsburgh, PA USA
[5] Childrens Oncol Grp, Arcadia, CA USA