Morphine for treatment of cough in idiopathic pulmonary fibrosis (PACIFY COUGH): a prospective, multicentre, randomised, double-blind, placebo-controlled, two-way crossover trial.
Wu Z, Spencer LG, Banya W, Westoby J, Tudor VA, Rivera-Ortega P, Chaudhuri N, Jakupovic I, Patel B, Thillai M, West A, Wijsenbeek M, Maher TM, Smith JA, Molyneaux PL.