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Tilstra DJ, Grove M, Spencer AC, Norwood TH, Pagon RA.Tilstra DJ, et al. Among authors: norwood th.Am J Med Genet. 1993 Jun 15;46(5):517-9. doi: 10.1002/ajmg.1320460511.Am J Med Genet. 1993.PMID: 8322812Review.