Prevention of COPD exacerbations: a European Respiratory Society/American Thoracic Society guideline.
Wedzicha JA, Calverley PMA, Albert RK, Anzueto A, Criner GJ, Hurst JR, Miravitlles M, Papi A, Rabe KF, Rigau D, Sliwinski P, Tonia T, Vestbo J, Wilson KC, Krishnan JA. Prevention of COPD exacerbations: a European Respiratory Society/American Thoracic Society guideline. Eur Respir J. 2017 09; 50(3).