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Witjes MJ, Speelman OC, Nikkels PG, Nooren CA, Nauta JM, van der Holt B, van Leengoed HL, Star WM, Roodenburg JL.Witjes MJ, et al. Among authors: nikkels pg.Br J Cancer. 1996 Mar;73(5):573-80. doi: 10.1038/bjc.1996.100.Br J Cancer. 1996.PMID: 8605089Free PMC article.