长期应用小剂量茶碱对稳定期慢性阻塞性肺疾病患者肺功能及预后的影响
장기응용소제량다감대은정기만성조새성폐질병환자폐공능급예후적영향
The effect of theophylline used with long-term and low-dose on patients' lung function and prognosis suffering from stable chronic obstructive pulmonary disease
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