title: Ultrasonic estimation of gestational age in the lowland gorilla: a biparietal diameter growth curve.
mesh_terms: D000818:Animals; D005260:Female; D005325:Fetal Organ Maturity; D005865:Gestational Age; D006071:Gorilla gorilla / Q000196:embryology*; D011247:Pregnancy; D012886:Skull / Q000196:embryology*; D014463:Ultrasonography