International Journal of COPD, Vol Volume 16, Pp 1621-1636 (2021) Begg, M, Hamblin, J N, Jarvis, E, Bradley, G, Mark, S, Michalovich, D, Lennon, M, Wajdner, H E, Amour, A, Wilson, R, Saunders, K, Tanaka, R, Arai, S, Tang, T, Van Holsbeke, C, De Backer, J, Vos, W, Titlestad, I L, FitzGerald, J M, Killian, K, Bourbeau, J, Poirier, C, Maltais, F, Cahn, A & Hessel, E M 2021, ' Exploring PI3Kδ molecular pathways in stable COPD and following an acute exacerbation, two randomized controlled trials ', International Journal of COPD, vol. 16, pp. 1621-1636 . https://doi.org/10.2147/COPD.S309303 International Journal of Chronic Obstructive Pulmonary Disease