Contact X-ray brachytherapy (CXB) as a salvage treatment for rectal cancer patients who developed local tumor re-growth after watch-and-wait approach - Than, Ngu Wah; Pritchard, Mark; Duckworth, Carrie. A.; Hughes, David M.; Wong, Helen; Sripadam, Rajaram; Myint, Arthur Sun (Journal of Contemporary Brachytherapy, 2024)