1. Research Fellow in Public Health Evaluation, Department of Global Health and Development, London School of Hygiene & Tropical Medicine, London, UK
2. Professor of Health Policy, Department of Health Sciences, University of York, York, UK
3. Consultant Physician in Sexual Heath Physician, HIV and HTLV-1 Medicine, Stonewall Medical Centre, Brisbane, Australia
4. Senior Clinical Lecturer, School of Public Health, University of Queensland, Brisbane, Australia
5. Mary Kinross Trust & Royal College of Surgeons Chair in Surgical Trials and Health Sciences, York Trials Unit, Department of Health Sciences, University of York, York, UK