[A comparison of curative effect of small-dose recombinant tissue plasminogen activator given at different time on ventricular function and prognosis in the patients with acute myocardial infarction.] Zhongguo wei zhong bing ji jiu yi xue = Chinese critical care medicine = Zhongguo weizhongbing jijiuyixue [Zhongguo Wei Zhong Bing Ji Jiu Yi Xue] Journal article