GAP Index for Idiopathic Pulmonary Fibrosis Ley et al. 2012 GAP Index for Idiopathic Pulmonary Fibrosis
Ley B, Ryerson CJ, Vittinghoff E, et al. A multidimensional index and staging system for idiopathic pulmonary fibrosis. Ann Intern Med. 2012;156(10):684-91. PMID: 22586007