[1] McMaster Univ, Hamilton, ON, Canada
[2] Radiat Therapy Oncol Grp Headquarters, Philadelphia, PA USA
[3] Mayo Clin, Rochester, MN USA
[4] MD Anderson Canc Ctr, Houston, TX USA
[5] Univ Hosp Cleveland, Cleveland, OH 44106 USA
[6] Thomas Jefferson Univ Hosp, Philadelphia, PA 19107 USA
[7] Washington Univ, Sch Med, St Louis, MO USA
[8] Duke Univ, Med Ctr, Durham, NC USA