Re: Ultrasound for monitoring controlled ovarian stimulation: a systematic review and meta-analysis of randomized controlled trials. W. P. Martins, C. V. R. Vieira, D. M. Teixeira, M. A. P. Barbosa, L. A. Dassunção and C. O. Nastri. Ultrasound Obstet Gynecol 2014; 43: 25-33