TY - CHAP M1 - Book, Section TI - Physiology of Labor A1 - Cunningham, F. Gary A1 - Leveno, Kenneth J. A1 - Bloom, Steven L. A1 - Dashe, Jodi S. A1 - Hoffman, Barbara L. A1 - Casey, Brian M. A1 - Spong, Catherine Y. Y1 - 2018 N1 - T2 - Williams Obstetrics, 25e AB - From time immemorial inquiring minds have sought an explanation for the fact that labour usually ensues about 280 days after the appearance of the last menstrual period, but thus far no satisfactory universal cause has been discovered.—J. Whitridge Williams (1903) SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/03/28 UR - accessmedicine.mhmedical.com/content.aspx?aid=1160774982 ER -