1. Henry Wellcome Laboratories for Integrative Neuroscience and Endocrinology (D.E.H., G.M.R., J.A.D., S.A.W., S.L.L.), University of Bristol, Bristol BS1 3NY, United Kingdom
2. Faculty of Medicine, Dentistry, and Health Sciences (D.E.H.), University of Western Australia, Perth 6009, Western Australia
3. Departments of Respiratory Medicine (F.B., R.G., J.R.C.), University Hospitals Bristol, Bristol BS1 3NU, United Kingdom
4. Clinical Biochemistry (W.W.W.), University Hospitals Bristol, Bristol BS1 3NU, United Kingdom