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Gray scale ultrasound for the investigation of early pregnancy.
Defoort P, Van Eyck J, De Schryver D, Thiery M, Martens G. Defoort P, et al. Among authors: de schryver d. Eur J Obstet Gynecol Reprod Biol. 1978 Feb;8(1):9-14. doi: 10.1016/0028-2243(78)90004-7. Eur J Obstet Gynecol Reprod Biol. 1978. PMID: 400859