1. Consultant in general and vascular surgery, Department of General & Vascular Surgery, Watford General Hospital, Watford, UK
2. Consultant in general and vascular surgery, Department of Vascular Surgery, Royal Free Hospital, Royal Free London NHS Foundation Trust, London, UK
3. Research Associate, Social Science Research Unit and EPPI-Centre, UCL Institute of Education, London, UK
4. Research scholar, Department of statistics, Public Health Evidence, South Asia (PHESA), Manipal University, Manipal, India