[Echographic semeiotics and preterm labor].
D005260:Female; D006801:Humans; D007752:Obstetric Labor, Premature / Q000175:diagnosis* / Q000503:physiopathology; D011247:Pregnancy; D014463:Ultrasonography; D014590:Uterine Contraction
Semeiotica ecografica e travaglio pretermine.