Maher, Toby M Pirfenidone in patients with unclassifiable progressive fibrosing interstitial lung disease: design of a double-blind, randomised, placebo-controlled phase II trial. [electronic resource] - BMJ open respiratory research 2018 - e000289 p. digital Publication Type: Journal Article ISSN: 2052-4439 Standard No.: 10.1136/bmjresp-2018-000289 doi