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Efficacy and safety of Qing-Feng-Gan-Ke Granules in patients with postinfectious cough: study protocol of a novel-design phase III placebo-controlled, double-blind randomized trial

Crossref DOI link: https://doi.org/10.1186/s12906-015-0812-3

Published Online: 2015-08-19

Published Print: 2015-12

Update policy: https://doi.org/10.1007/springer_crossmark_policy

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