1. Loyola Univ Chicago Med Ctr, Maywood, IL; Radiation Therapy Oncology Group, Philadelphia, PA; Memorial Sloan-Kettering Cancer Ctr, New York, NY; Wayne State University/Karmanos Cancer Ctr, Detroit, MI; Princess Margaret Hosp, Toronto, ON, Canada; Tom Baker Cancer Ctr, Calgary, AB, Canada; UC Davis Cancer Ctr, Sacramento, CA; Vanderbilt-Ingram Cancer Ctr, Nashville, TN; Medcl Univ of South Carolina, Charleston, SC; Mayo Clinic, Rochester, MN