1 School of Physics, University of Western Australia, Australia; Faculty of Health Sciences, National University of Malaysia, Bangi, Malaysia. Electronic address: noorazrul.yahya@research.uwa.edu.au
2 School of Physics, University of Western Australia, Australia; Department of Radiation Oncology, Sir Charles Gairdner Hospital, Australia
3 Institute for Health Research, University of Notre Dame, Fremantle, Australia
4 Department of Physical Sciences, Peter MacCallum Cancer Centre, Melbourne, Australia; Sir Peter MacCallum Department of Oncology, University of Melbourne, Australia
5 Department of Radiation Oncology, Sir Charles Gairdner Hospital, Australia
6 Department of Radiation Oncology, Sir Charles Gairdner Hospital, Australia; School of Surgery, University of Western Australia, Australia
7 School of Medicine and Public Health, University of Newcastle, Australia