Design and rationale of two phase 3 randomised controlled trials (COUGH-1 and COUGH-2) of gefapixant, a P2X3 receptor antagonist, in refractory or unexplained chronic cough by David R. Muccino, Alyn H. Morice, Surinder S. Birring, Peter V. Dicpinigaitis, Ian D. Pavord, Christopher Assaid, Huub Jan Kleijn, Azher Hussain, Carmen La Rosa, Lorcan McGarvey, Jaclyn A. Smith

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