Ring, N., Jepson, R., Hoskins, G., Wilson, C., Pinnock, H., Sheikh, A., & Wyke, S. (2011). Understanding what helps or hinders asthma action plan use: A systematic review and synthesis of the qualitative literature. Patient Education and Counseling, 85(2), e131-e143. https://doi.org/10.1016/j.pec.2011.01.025