1. Vascular Surgery ServiceDepartment of General Surgery, Tan Tock Seng Hospital Singapore
2. Nursing ServiceTan Tock Seng Hospital Singapore
3. Centre for Population Health SciencesNanyang Technological University Lee Kong Chian School of Medicine Singapore
4. Office of Clinical EpidemiologyAnalytics and Knowledge, Tan Tock Seng Hospital Singapore
5. Skin Research Institute of Singapore, Agency for Science, Technology and Research (A*STAR) Singapore
6. Health Services and Outcomes ResearchNational Health Group Singapore