First maintenance therapy for COPD in the UK between 2009 and 2012: a retrospective database analysis by Pavord, I, Price, D, Miravitlles, M, Thomas, M, Wedzicha, J, Haughney, J, Bichel, K, West, D

Effect of home noninvasive ventilation with oxygen therapy vs oxygen therapy alone on hospital readmission or death after an acute COPD exacerbation: a randomized clinical trial by Murphy, P, Rehal, S, Arbane, G, Bourke, S, Calverley, P, Crook, A, Dowson, L, Duffy, N, Gibson, G, Hughes, P, Hurst, J, Lewis, K, Mukherjee, R, Nickol, A, Oscroft, N, Patout, M, Pepperell, J, Smith, I, Stradling, J, Wedzicha, J, Polkey, M, Elliott, M, Hart, N