EP-1859: How useful are Dose Reference Levels in Radiotherapy? A regional treatment planning CT dose audit. (April 2018) - McCallum, H.; Lecomber, A.; Tulip, R.; Greenhalgh, A.; Pilling, K.; Taylor, H.; Bayles, H.; Chapple, C.L.; Robson, K.; Willis, J.; Byrne, J.