1. Department of Radiation Oncology; University of Michigan; Ann Arbor Michigan
2. Department of Radiation Oncology; Georgetown University; Washington District of Columbia
3. Department of Oncology; Sohag University; Sohag Egypt
4. Department of Radiation Oncology; Cedars-Sinai Medical Center; Los Angeles California
5. Department of Radiation Oncology; University of California-San Francisco; San Francisco California
6. Department of Radiation Oncology; Texas Oncology; Irving Texas