OC21.03: *Is the conventional ultrasound speed of 1540 m/s appropriate for examinations of obese patients? The POWUS study of pregnant women. (September 2016) - Chauveau, B.; Auclair, C.; Legrand, A.; Lelong, A.; Laurichesse, H.; Mangione, R.; Gerbaud, L.; Vendittelli, F.; Ouchchane, L.; Boyer, L.; Lemery, D.J.