Uterine contractile activity in healthy women throughout the menstrual cycle measured using a novel quantitative two-dimensional transvaginal ultrasound speckle tracking method

C.O. Rees, Anna De Boer, Yizhou Huang, Blijke Wessels, Celine Blank, N.P. Kuijsters, Aleida G. Huppelschoten, Brunella Zizolfi, Virginia Foreste, Attilio Di Spiezio Sardo, Nikos Christoforidis, Hubertus van Vliet, Massimo Mischi, B.C. Schoot