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Keisu M, Heit W, Lambertenghi-Deliliers G, Parcells-Kelly J, Polliack A, Heimpel H.Keisu M, et al. Among authors: heit w.Blut. 1990 Oct;61(4):240-4. doi: 10.1007/BF01744138.Blut. 1990.PMID: 2224146