[Letter: Control of fetal heart sounds and placenta localization].
D005260:Female; D005318:Fetal Heart; D006326:Heart Auscultation; D006801:Humans; D010920:Placenta / Q000033:anatomy & histology*; D011247:Pregnancy; D014465:Ultrasonics / Q000379:methods; D014463:Ultrasonography
Kontrolle kindlicher Herztöne und Plazentalokalisation