1. Metabolic Research Laboratories, Institute of Metabolic Science (A.K.A., A.W., N.K., E.L.G., C.H.S., S.O., S.A., H.L.S., M.G.), Cambridge, United Kingdom CB2 0QQ
2. Clinical Pharmacology Unit (M.E., K.M.-P., I.B.W.), Cambridge, United Kingdom CB2 0QQ
3. Departments of Cardiovascular Medicine (M.E., F.K., D.P.D.), Cambridge, United Kingdom CB2 0QQ
4. the Respiratory Support and Sleep Centre (S.M., J.M.S.), Papworth Hospital, Papworth Everard, Cambridge, United Kingdom CB23 3RE
5. Clinical Biochemistry (D.J.H.), Cambridge, United Kingdom CB2 0QQ
6. Renal Medicine (A.N.C.), Cambridge, United Kingdom CB2 0QQ
7. Radiology (L.B., D.J.S., N.M.A.), Cambridge, United Kingdom CB2 0QQ
8. Neurosurgery (J.D.P.), University of Cambridge and National Institute for Health Research Cambridge Biomedical Research Centre, Addenbrooke's Hospital, Cambridge, United Kingdom CB2 0QQ