[1] Tan Tock Seng Hosp, Dept Gen Surg, Vasc Surg Serv, Singapore G3 7RH, Singapore
[2] Tan Tock Seng Hosp, Dept Radiol, Intervent Radiol Serv, Singapore G3 7RH, Singapore
[3] Tan Tock Seng Hosp, Dept Gastroenterol, Div Med, Singapore G3 7RH, Singapore
[4] Tan Tock Seng Hosp, Dept Infect Dis, Div Med, Singapore G3 7RH, Singapore
[5] Tan Tock Seng Hosp, Dept Cardiol, Div Med, Singapore G3 7RH, Singapore