Comparison 4. Carlos Aravena Gonzalo Labarca Carmen Venegas Alex Arenas Gabriel Rada 10.1371/journal.pone.0136160.g006 https://plos.figshare.com/articles/figure/_Comparison_4_/1522964 <p>Acute exacerbation.</p> 2015-08-26 03:14:57 systematic review rr literature search mortality function tests quality assessment fvc 5 RCTs ipf data extraction benefit findings table decades pirfenidone pirfenidone treatment exacerbation Idiopathic Pulmonary Fibrosis collagen production decline progression outcome ic GRADE approach pfs language restriction