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van Essen AJ, Kneppers AL, van der Hout AH, Scheffer H, Ginjaar IB, ten Kate LP, van Ommen GJ, Buys CH, Bakker E.van Essen AJ, et al. Among authors: scheffer h.J Med Genet. 1997 Oct;34(10):805-12. doi: 10.1136/jmg.34.10.805.J Med Genet. 1997.PMID: 9350811Free PMC article.