Re: Office gel sonovaginography for the prediction of posterior deep infiltrating endometriosis: a multicenter prospective observational study. S. Reid, C. Lu, N. Hardy, I. Casikar, G. Reid, G. Cario, D. Chou, D. Almashat and G. Condous. Ultrasound Obstet Gynecol 2014; 44: 710-718