1. Center for Pharmacology and Therapeutics, Experimental Medicine, Hammersmith Hospital, Imperial College London, United Kingdom (A.A., J.C., O.D., J.W., M.R.W., L.Z.)
2. Department of Pulmonary Medicine (O.A.S., H.J.H., F.S.d.M., L.B., S.J., A.V.N., H.J.B.)
3. Department of Radiology and Nuclear Medicine (A.A.L., M.C.H., V.F., R.B., F.S.d.M.), VU University Medical Center, Amsterdam, the Netherlands
4. Max-Planck Institute for Heart and Lung Research, University of Giessen and Marburg Lung Center, German Center for Lung Research, Bad Nauheim (S.D., S.S.P.).