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Beta-Blockers Reduced the Risk of Mortality and Exacerbation in Patients with COPD: A Meta-Analysis of Observational Studies
- Qingxia Du,
- Yongchang Sun,
- Ning Ding,
- Lijin Lu,
- Ying Chen
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- Published: November 26, 2014
- https://doi.org/10.1371/journal.pone.0113048