Re: Reproducibility of first- and second-trimester uterine artery pulsatility index measured by transvaginal and transabdominal ultrasound. A.E.G.M.T. Ferreira, F. Mauad Filho, P.S.G. Abreu, F.M. Mauad, E. Araujo Jr and W.P. Martins. Ultrasound Obstet Gynecol 2015; 46: 546-552