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van der Valk P, van Kalken CK, Ketelaars H, Broxterman HJ, Scheffer G, Kuiper CM, Tsuruo T, Lankelma J, Meijer CJ, Pinedo HM, et al.van der Valk P, et al. Among authors: broxterman hj.Ann Oncol. 1990;1(1):56-64.Ann Oncol. 1990.PMID: 1706611Free article.