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APA Citation
Tol, J. P., Doornaert, P., Witte, B. I., Dahele, M., Slotman, B. J., & Verbakel, W. F. (n.d.). a longitudinal evaluation of improvements in radiotherapy treatment plan quality for head and neck cancer patients. Radiotherapy and oncology, 119(2), 337–343. http://access.bl.uk/ark:/81055/vdc_100032676759.0x000063