Hasegawa, J; Matsuoka, R; Ichizuka, K; Sekizawa, A; Okai, T (março de 2009). «Ultrasound diagnosis and management of umbilical cord abnormalities.». Taiwanese Journal of Obstetrics & Gynecology. 48 (1): 23–7. PMID19346188. doi:10.1016/S1028-4559(09)60031-0
MacLennan, AH; Thompson, SC; Gecz, J (dezembro de 2015). «Cerebral palsy: causes, pathways, and the role of genetic variants.». American Journal of Obstetrics and Gynecology. 213 (6): 779–88. PMID26003063. doi:10.1016/j.ajog.2015.05.034
Hasegawa, J; Matsuoka, R; Ichizuka, K; Sekizawa, A; Okai, T (março de 2009). «Ultrasound diagnosis and management of umbilical cord abnormalities.». Taiwanese Journal of Obstetrics & Gynecology. 48 (1): 23–7. PMID19346188. doi:10.1016/S1028-4559(09)60031-0
MacLennan, AH; Thompson, SC; Gecz, J (dezembro de 2015). «Cerebral palsy: causes, pathways, and the role of genetic variants.». American Journal of Obstetrics and Gynecology. 213 (6): 779–88. PMID26003063. doi:10.1016/j.ajog.2015.05.034