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Title
Re: Effect of letrozole on uterine artery Doppler flow indices prior to first-trimester termination of pregnancy: a randomized controlled trial. V. C. Y. Lee, T. W. Y. Yeung, O. S. Tang, E. H. Y. Ng, W. S. B. Yeung and P. C. Ho. Ultrasound Obstet Gynecol 2012; 40: 392-397.