Stratifying risk in asymptomatic patient with severe valvular heart disease .
无症状的严重心脏瓣膜病患者的危险分层。
Via fashion accessories , mobile phones and now cars , brand choices are stratifying a hitherto communist society .
通过时尚服饰、手机、如今还有汽车，品牌选择正让这个迄今仍然姓“社”的社会分出阶层。
Conclusion - : d-dimer levels may be useful in risk stratifying patients with suspected aortic dissection to rule out aortic dissection if used within the first 24 hours after symptom onset .
