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International Circulation: Last November， you published an article entitled “Randomized， Double-Blind， Multicenter Study of the Polymer-Based 17-Beta Estradiol-Eluting Stent for Treatment of Native Coronary Lesions: Six-Month Results of the ETHOS I Trial” in Catheter Cardiovascular Intervention. You found that the 17-beta estradiol-eluting R stent was well-tolerated， but showed no benefit for treatment of coronary lesions when compared to controls. What is your opinion about these results?