1. Leeds Centre for Respiratory Medicine, St James's University Hospital, Beckett Street; Leeds LS9 7TF United Kingdom
2. Leeds Institute of Health Sciences, 101, Clarendon Rd, Leeds LS2 9LJ; United Kingdom
3. Université Paris 13; Bobigny France
4. AP-HP; Paris France
5. Wessex Institute of Health and Research, Faculty of Medicine; University of Southampton; SO16 7NS United Kingdom
6. Leeds Institute of Biomedical and Clinical Sciences; St James's University Hospital; Beckett Street Leeds LS9 7TF United Kingdom