Use of low-dose oral theophylline as an adjunct to inhaled corticosteroids in preventing exacerbations of chronic obstructive pulmonary disease : study protocol for a randomised controlled trial

Devereux, G, Cotton, S, Barnes, P, Briggs, A, Burns, G, Chaudhuri, R, Chrystyn, H, Davies, L, De Soyza, A, Fielding, S, Gompertz, S, Haughney, J A F, Lee, A J, McCormack, K, McPherson, G, Morice, A, Norrie, J, Sullivan, A, Wilson, A & Price, D 2015, 'Use of low-dose oral theophylline as an adjunct to inhaled corticosteroids in preventing exacerbations of chronic obstructive pulmonary disease : study protocol for a randomised controlled trial', Trials, vol. 16, 267. https://doi.org/10.1186/s13063-015-0782-2