[1] Univ Dundee, Mol & Clin Med, Dundee, Scotland
[2] Ninewells Hosp, Dept Radiol, Dundee, Scotland
[3] AstraZeneca, Translat Sci & Expt Med, Res & Early Dev Resp & Immunol, BioPharmaceut R&D, Gothenburg, Sweden
[4] AstraZeneca, Translat Sci & Expt Med, Res & Early Dev Resp & Immunol, BioPharmaceut R&D, Cambridge, England
[5] AstraZeneca, Res & Early Dev Resp & Immunol, BioPharmaceut R&D, Gothenburg, Sweden