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van Wamelen DJ, Klumper FJ, de Haas M, Meerman RH, van Kamp IL, Oepkes D.van Wamelen DJ, et al. Among authors: klumper fj.Obstet Gynecol. 2007 May;109(5):1093-8. doi: 10.1097/01.AOG.0000260957.77090.4e.Obstet Gynecol. 2007.PMID: 17470588
van Kamp IL, Klumper FJ, Meerman RH, Brand A, Bennebroek Gravenhorst J, Kanhai HH.van Kamp IL, et al. Among authors: klumper fj.Ned Tijdschr Geneeskd. 1999 Dec 11;143(50):2527-31.Ned Tijdschr Geneeskd. 1999.PMID: 10627756Dutch.
van Kamp IL, Klumper FJ, Bakkum RS, Oepkes D, Meerman RH, Scherjon SA, Kanhai HH.van Kamp IL, et al. Among authors: klumper fj.Am J Obstet Gynecol. 2001 Sep;185(3):668-73. doi: 10.1067/mob.2001.116690.Am J Obstet Gynecol. 2001.PMID: 11568796