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Snijders-Keilholz A, Hellebrekers BW, Zwinderman AH, van de Vijver MJ, Trimbos JB.Snijders-Keilholz A, et al. Among authors: trimbos jb.Radiother Oncol. 1999 May;51(2):161-7. doi: 10.1016/s0167-8140(99)00056-0.Radiother Oncol. 1999.PMID: 10435808