Yorke, J., Swigris, J., Russell, A., Moosavi, S., Man Ng Kwong, G., Longshaw, M., & Jines, P. (2011). Dyspnoea-12 is a valid and reliable measure of breathlessness in patients with ILD. Chest, 139(1), 159-164. https://doi.org/10.1378/chest.10-0693