Johnson, M. J., Cockayne, S., Currow, D. C., Bell, K., Hicks, K., Fairhurst, C., …Clark, A. (2019). Oral modified release morphine for breathlessness in chronic heart failure: a randomized placebo-controlled trial. ESC Heart Failure, 6(6), 1149-1160. https://doi.org/10.1002/ehf2.12498