The influence of cigarette smoking on lung function in patients with idiopathic pulmonary fibrosis.
Schwartz DA, Merchant RK, Helmers RA, Gilbert SR, Dayton CS, Hunninghake GW. The influence of cigarette smoking on lung function in patients with idiopathic pulmonary fibrosis. Am Rev Respir Dis. 1991 Sep; 144(3 Pt 1):504-6.