1. Department of Radiation Oncology; University of Iowa Hospitals and Clinics; Iowa City IA USA
2. UT MD Anderson Cancer Center; Houston TX USA
3. Department of Radiation Oncology; Washington University; Saint Louis MO USA
4. Department of Radiation Oncology; Allegheny General Hospital; Pittsburgh PA USA
5. Department of Radiation Oncology; Rhode Island Hospital; Providence RI USA
6. Center for Proton Therapy; Paul Scherrer Institute; Villigen Switzerland
7. Radiation Oncology; New York Presbyterian Hospital; New York NY USA
8. Dept of Medical Physics; Memorial Sloan-Kettering Cancer Center; New York NY USA
9. Radiation Oncology; Vassar Brothers Hospital; Poughkeepsie NY USA
10. Sun Nuclear Corporation; Melbourne FL USA
11. Radiation Therapy; VA Medical Center -VA Puget Sound Health Care System; Seattle WA USA
12. Dept. of Radiation Physics - Unit 1150; UT MD Anderson Cancer Center; Houston TX USA