Value of pulmonary function testing identifying progressive pulmonary disease in fibrotic sarcoidosis: results of a prospective feasibility study - Baughman, Robert P.; Gupta, Rohit; Judson, Marc; Lower, Elyse; Birrinder, Surinder; Stewart, Jeffrey; Reeves, Rebecca; Wells, Athol (Sarcoidosis, Vasculitis and Diffuse Lung Diseases, 2022)