Smith, B., Traboulsi, H., Austin, J., Manichaikul, A., Hoffman, E., Bleecker, E., … SPIROMICS, investigators. M. L. and. (2018). Human airway branch variation and chronic obstructive pulmonary disease. Proceedings of the National Academy of Sciences of the United States of America. https://doi.org/10.1073/pnas.1715564115 (Original work published 2018)

Bhatt, S., Anderson, J., Brook, R., Calverley, P., Celli, B., Cowans, N., … Dransfield, M. (2018). Cigarette smoking and response to inhaled corticosteroids in COPD. The European Respiratory Journal, 51(1). https://doi.org/10.1183/13993003.01393-2017