1. From the Division of Infectious Diseases, Department of Medicine, National University Health System , Singapore 119228
2. Vascular and Interventional Radiology, Department of Diagnostic Radiology, Tan Tock Seng Hospital , Singapore 308433
3. Vascular Surgery Service, Department of General Surgery, Tan Tock Seng Hospital , Singapore 308433
4. Department of Infectious Diseases, National Centre for Infectious Diseases, Tan Tock Seng Hospital , Singapore 308433