Postoperative Single-Fraction Partial-Breast Irradiation for Stage 0 and I Breast Carcinoma: Results of a Prospective Single Institution Phase I/II Clinical TrialKennedy, W.R.; Thomas, M.A.; DeBroeck, K.R.; Ochoa, L.L.; Green, O.L.; Zoberi, I. · International Journal of Radiation Oncology*Biology*Physics · 2019