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检查了52例缺血性心脏病病人吸烟对心血管的影响。病人年龄在75岁以下,该研究用随机化方法,采用吸烟日和非吸烟对照日交叉比较法,两者最少相隔
Check the 52 patients with ischemic heart disease smoking on cardiovascular effects. Patients under the age of 75 years, the study randomized method using smoking day and non-smoking control cross-day comparison method, the two separated at least