Results Various predisposing diseases were found in 95% of total cases, among them, COPD,systemic lupus erythromatus(SLE),leukemia and chronic renal disease were main predisposing diseases.

• 结果95%25(120/127)的病例患有基础疾病，其中以慢性阻塞性肺疾病(COPD)、系统性红斑狼疮、白血病和慢性肾病为多见。