Task: Answer Verification
Input (English): Question: Is vagifem superior to vaginal Premarin in induction of endometrial thickness in the frozen-thawed cycle patients with refractory endometria : A randomized clinical trial?
Answer: Vagifem is superior to Premarin in induction of endometrial thickness in frozen-thawed embryo transfer cycles in the patients with refractive endometria.
Output (English): yes