Elevation of Uterine Basal Tone and Fetal Heart Rate Abnormalities After Labor Analgesia: A Randomized Controlled Trial OBSTETRICS AND GYNECOLOGY Landau, R., Carvalho, B., Wong, C., Smiley, R., Tsen, L., Van de Velde, M. 2009; 113 (6): 1374-1374

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