<qa>  What is the name of the study that randomized controlled trial?2. Pickar JH, Yeh I, Wheeler JE, Cunnane MF, Speroff L. Endometrial effects of lower doses of conjugated equine estrogens and medroxyprogesterone acetate. Journal Article. Multicenter Study. Randomized Controlled Trial Fertil Steril 2001;76:25-31. 