1. From the Fox Chase Cancer Center and the Radiation Therapy Oncology Group, Philadelphia, and Mercy Hospital of Scranton, Scranton, PA; Harper Hospital, Wayne State University, Detroit, MI; University of Western Ontario, London, Ontario, Canada; Medical College of Wisconsin, Milwaukee, WI; Radiological Associates of Sacramento, Sacramento, CA; University of Michigan Medical School, Ann Arbor, MI; and Massachusetts General Hospital, Boston, MA.