Date, K., Williams, B., Cohen, J., Chaudhuri, N., Bajwah, S., Pearson, M., Higginson, I., Norrie, J., Keerie, C., Tuck, S., Hall, P., Currow, D., Fallon, M., & Johnson, M. (2023). Modified-release morphine or placebo for chronic breathlessness: the MABEL trial protocol. ERJ Open Research, 9(4), Article 00167. https://doi.org/10.1183/23120541.00167-2023