AIM: To observe the effects of Biostim in prevention and improvation of recurrent lower respiratory tract infection in chronic obstructive pulmonary diseases (COPD).
目的：观察必思添改善慢性阻塞性肺疾病反复下呼吸道感染的疗效。
AIM: To observe the effects of Biostim in prevention and improvation of recurrent lower respiratory tract infection in chronic obstructive pulmonary diseases (COPD).
目的：观察必思添改善慢性阻塞性肺疾病反复下呼吸道感染的疗效。
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