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2. Multiple pregnancy. 1;Benirschke;N Engl J Med,1973
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4. Cord entanglement in monochorionic diamniotic twins;Krause;Aust N Z J Obstet Gynaecol,1998
5. Pseudomonoamniotic twins with cord entanglement following genetic funipuncture;Megory;Obstet Gynecol,1991