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van der Lei B, Hoekstra HJ, Veth RP, Ham SJ, Oldhoff J, Schraffordt Koops H.van der Lei B, et al. Among authors: schraffordt koops h.J Surg Oncol. 1992 Aug;50(4):216-9. doi: 10.1002/jso.2930500403.J Surg Oncol. 1992.PMID: 1322479