沙美特罗替卡松联合噻托溴铵治疗稳定期COPD的临床观察
사미특라체잡송연합새탁추안치료은정기COPD적림상관찰
Clinical observation of salmeterol/fluticasone propionate combined with tiotropium bromide in the treatment of COPD patients at stable stage
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