title: The measurement of fetal breathing movements with A-scan and Doppler techniques.
mesh_terms: D004301:Doppler Effect; D005260:Female; D005323:Fetal Monitoring / Q000379:methods*; D005333:Fetus / Q000502:physiology*; D006801:Humans; D009068:Movement; D011247:Pregnancy; D012119:Respiration; D014465:Ultrasonics / Q000295:instrumentation; D014463:Ultrasonography