title: Duration of the active phase of labor in twin pregnancies.
authors.forename: Shunji
authors.initials: S
authors.lastname: Suzuki
authors.forename: Michiko
authors.initials: M
authors.lastname: Nakagawa
mesh_terms: D001724:Birth Weight; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn; D007747:Labor Stage, First / Q000502:physiology*; D011247:Pregnancy; D014427:Twins