AUditive Direct In-utero Observation (AUDIO): Prenatal Testing of Congenital Hypoacusis

"An auditive stimulus was produced by hitting a diapason on an acoustic surface, at a distance of 2-3 cm from the mother's skin (in order to avoid mechanical vibration to reach the fetus) in the area near the fetus' head.~The same procedure was repeated three times, waiting 30 seconds between one stimulus and the following one. The total duration of stimulation was about 2 minutes."