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Collette L, Sylvester RJ, Stenning SP, Fossa SD, Mead GM, de Wit R, de Mulder PH, Neymark N, Lallemand E, Kaye SB.Collette L, et al. Among authors: sylvester rj.J Natl Cancer Inst. 1999 May 19;91(10):839-46. doi: 10.1093/jnci/91.10.839.J Natl Cancer Inst. 1999.PMID: 10340903Clinical Trial.