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Di Naro, Edoardo; Raio, Luigi; Cromi, Antonella; Giocolano, Alessandra (2012). Sonographic Assessment of the Umbilical Cord. Donald School Journal of Ultrasound in Obstetrics and Gynecology, 6(1), pp. 66-75. Jaypee Brothers Medical Publishers 10.5005/jp-journals-10009-1227
