title: The natural history of the normal first stage of labor.
authors.affiliation: From the Division of Epidemiology, Statistics and Prevention Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland; the Department of Clinical Epidemiology, Bremen Institute for Prevention Research and Social Medicine, Bremen University, Bremen, Germany; and the Department of Obstetrics and Gynecology, University of Montreal, Montreal, Quebec, Canada.
authors.forename: Jun
authors.initials: J
authors.lastname: Zhang
authors.forename: James
authors.initials: J
authors.lastname: Troendle
authors.forename: Rafael
authors.initials: R
authors.lastname: Mikolajczyk
authors.forename: Rajeshwari
authors.initials: R
authors.lastname: Sundaram
authors.forename: Julie
authors.initials: J
authors.lastname: Beaver
authors.forename: William
authors.initials: W
authors.lastname: Fraser
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D007747:Labor Stage, First / Q000502:physiology*; D010298:Parity; D011247:Pregnancy; D012016:Reference Values; D055815:Young Adult