The safety of using sonar.
D000818:Animals; D001808:Blood Vessels / Q000293:injuries; D002642:Chick Embryo; D002875:Chromosomes; D000013:Congenital Abnormalities / Q000209:etiology; D004622:Embryo, Mammalian; D005260:Female; D005333:Fetus; D006801:Humans; D011247:Pregnancy; D012377:Rodentia; D014465:Ultrasonics / Q000009:adverse effects*; D014463:Ultrasonography