1 National Institute for Health Research Southampton Biomedical Research Centre, University Hospital Southampton, Southampton, UK Timothy.Wallis@soton.ac.uk.
2 School of Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, Southampton, UK.
3 Centre for Medical Image Computing, University College London, London, UK.
4 National Institute for Health Research Southampton Biomedical Research Centre, University Hospital Southampton, Southampton, UK.
5 Dept of Respiratory Medicine, Ege University Hospital, Izmir, Turkey.
6 Dept of Radiology, Ege University Hospital, Izmir, Turkey.
7 Dept of Cardiothoracic Radiology, University Hospital Southampton, Southampton, UK.
8 Unità Operativa Complessa di Pneumologia, Università Cattolica del Sacro Cuore, Fondazione Policlinico A. Gemelli, Rome, Italy.
9 UCL Respiratory, University College London, London, UK.