Ekström, M., Williams, M., Johnson, M. J., Huang, C., & Currow, D. C. (2019). Agreement between breathlessness severity and unpleasantness in people with chronic breathlessness: A longitudinal clinical study. Journal of Pain and Symptom Management, 57(4), 715-723.e5. https://doi.org/10.1016/j.jpainsymman.2019.01.001