Ninane, V., Brusselle, G. G., Louis, R., Dupont, L., Liistro, G., De Backer, W., Schlesser, M., & Vincken, W. (2014). Usage of inhalation devices in asthma and chronic obstructive pulmonary disease: A Delphi consensus statement. Expert Opinion on Drug Delivery, 11(3), 313-323. https://doi.org/10.1517/17425247.2014.872626 (Original work published 2014)