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Four‐vessel umbilical cord - Avnet - 2011 - Ultrasound in Obstetrics & Gynecology - Wiley Online Library
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Prenatal diagnosis of Type II single umbilical artery (persistent vitelline artery) in a normal fetus - Gámez - 2013 - Ultrasound in Obstetrics & Gynecology - Wiley Online Library
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