Authors: Owen, J Yost, N Berghella, V Thom, E Swain, M Dildy, GA Miodovnik, M Langer, O Sibai, B McNellis, D

Citation: J. Owen et al., Mid-trimester endovaginal sonography in women at high risk for spontaneouspreterm birth, J AM MED A, 286(11), 2001, pp. 1340-1348