Obstetrics — Diagnostic Part 1 Ultrasound and Prenatal Diagnostic Procedures in Obstetrics

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Byrne DL Marks K Braude PR Nicolaides KH. Amnifiltration in the first trimester: feasibility, technical aspects and cytological outcome. Ultrasound Obstet Gynecol 1991; 1: 320–324.

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Sundberg K Jorgensen FS Tabor A Bang J. Experience with early amniocentesis. J Perinat Med 1995; 23 (3):149–158.