1. Department of Oncology Detroit Michigan USA
2. Colorado Associates in Medical Physics Colorado Springs Colorado USA
3. Department of Radiation Oncology The Ohio State University Columbus Ohio USA
4. Department of Radiation Physics Houston Texas USA
5. Department of Medical Physics Madison Wisconsin USA
6. Penn State Health Milton S. Hershey Medical Center Hershey Pennsylvania USA
7. Department of Physics and Astronomy Baton Rouge Louisiana USA
8. Germantown Academy Fort Washington Pennsylvania USA
9. Mary Bird Perkins Cancer Center Louisiana State University Baton Rouge Louisiana USA
10. Department of Radiation Oncology Duke University Durham North Carolina USA
11. William Beaumont Hospital Dearborn Michigan USA
12. Barrow Neurological Institute Phoenix Arizona USA
13. Department of Oncology Wayne State University Detroit Michigan USA
14. Elekta, Inc. Crawley UK
15. Department of Radiation Oncology MD Anderson Cancer Center at Cooper/Cooper Medical School at Rowan University Camden New Jersey USA