Authors: Maarten G Lansberg; Martin J O'Donnell; Pooja Khatri; Eddy S Lang; Mai N Nguyen-Huynh; Neil E Schwartz; Frank A Sonnenberg; Sam Schulman; Per Olav Vandvik; Frederick A Spencer; Pablo Alonso-Coello; Gordon H Guyatt; Elie A Akl Journal: Chest Date: 2012-02 Impact factor: 9.410