1. Imperial College London; National Heart and Lung Institute; London UK
2. University of Birmingham; Department of Primary Care and General Practice; Edgbaston Birmingham UK BI5 2TT
3. University of York; Medicines Evaluation Group, Centre for Health; Heslington York UK YO10 5DD
4. University of York; Health Sciences and Clinical Evaluation; Alcuin College HESLINGTON York Yorkshire UK YO10 5DD
5. University of British Columbia; Department of Anesthesiology, Pharmacology and Therapeutics; 2176 Health Sciences Mall Vancouver BC Canada V6T 1Z3
6. University of Exeter Medical School; Institute of Health Research; Exeter UK EX2 4SG