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Bersinger, N.A.; Brandenberger, A.W.; Birkhäuser, M.H. (1995). Implantation: Endometrial and placental protein markers and ovarian steroids in serum during in-vitro fertilization cycles. Human reproduction, 10(8), pp. 2149-2154. Oxford University Press 10.1093/oxfordjournals.humrep.a136251
