1. Medical Physics & Applied Radiation Sciences, McMaster University, Hamilton, ON, Canada
2. Department of Medicine, McMaster University, Hamilton, ON, Canada
3. Department of Physics, Ryerson University, Toronto, ON, Canada
4. Canadian Nuclear Laboratories, Chalk River Laboratories, ON, Canada
5. University of Florida Proton Therapy Institute, Jacksonville, FL, USA
6. Ontario Power Generation, Whitby, ON, Canada