1. Department of Biomedical Informatics and Medical Statistics; Medical Research Institute, Alexandria University; Alexandria Egypt
2. Radiation Oncology; Mayo Clinic; Jacksonville Florida USA
3. Radiation Oncology; Icahn School of Medicine at Mount Sinai; New York USA
4. Radiation Oncology; University of Virginia; Charlottesville Virginia USA
5. Department of Radiation Oncology; Emory University; Atlanta USA