Keller T, Spece LJ, Donovan LM, Udris E, Coggeshall SS, Griffith M, Bryant AD, Casaburi R, Cooper JA, Criner GJ, Diaz PT, Fuhlbrigge AL, Gay SE, Kanner RE, Martinez FJ, Panos RJ, Shade D, Sternberg A, Stibolt T, Stoller JK, Tonascia J, Wise R, Yusen RD, Au DH, Feemster LC. Association of Guideline-Recommended COPD Inhaler Regimens With Mortality, Respiratory Exacerbations, and Quality of Life: A Secondary Analysis of the Long-Term Oxygen Treatment Trial. Chest. 2020 08; 158(2):529-538.