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Double Sac Sign and Intradecidual Sign in Early Pregnancy - Doubilet - 2013 - Journal of Ultrasound in Medicine - Wiley Online Library
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Salim R. Rezaie, MD on Twitter: "1st sign of IUP is yolk sac w/I gestational sac (DOUBLE RING SIGN) #FOAMed #Meded http://t.co/XfzMwfPl2P" / X
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First-trimester pregnancy failure (Chapter 30) - Ultrasonography in Reproductive Medicine and Infertility
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