title: Sonographic evaluation in the second stage of labor to improve the assessment of labor progress and its outcome.
authors.forename: Lami
authors.initials: L
authors.lastname: Yeo
authors.forename: Roberto
authors.initials: R
authors.lastname: Romero
mesh_terms: D036861:Delivery, Obstetric; D005260:Female; D006801:Humans; D007748:Labor Stage, Second / Q000502:physiology*; D010173:Palpation / Q000592:standards / Q000706:statistics & numerical data; D011247:Pregnancy; D011256:Pregnancy Outcome; D012307:Risk Factors; D016216:Ultrasonography, Prenatal / Q000379:methods*