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Flens MJ, van der Valk P, Tadema TM, Huysmans AC, Risse EK, van Tol GA, Meijer CJ.Flens MJ, et al. Among authors: risse ek.Cancer. 1990 Jun 15;65(12):2704-11. doi: 10.1002/1097-0142(19900615)65:12<2704::aid-cncr2820651218>3.0.co;2-f.Cancer. 1990.PMID: 1692758