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\bibitem{Perez-Calatayud_etal2022} Perez-Calatayud, J., Ballester, F., Tedgren, C., DeWerd, L. A., Papagiannis, P., Rivard, M. J., et al. (2022). GEC-ESTRO ACROP recommendations on calibration and traceability of HE HDR-PDR photon-emitting brachytherapy sources at the hospital level. \textit{Radiother. Oncol.}, \textit{176}, 108--117.

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