1. Vascular Surgery Unit, Department of Surgery, Universiti Kebangsaan Malaysia Medical Centre, Kuala Lumpur, Malaysia
2. Department of Surgery, Universiti Kebangsaan Malaysia Medical Centre, Kuala Lumpur, Malaysia
3. Department of General Surgery, Sarawak General Hospital, Kuching, Malaysia
4. Universiti Kebangsaan Malaysia Medical Centre, Kuala Lumpur, Malaysia