D N Basir1, P U Telisinghe2, I Bickle3, V H Chong1,4. 1. Department of Medicine, RIPAS Hospital, Bandar Seri Begawan, Brunei Darussalam. 2. Department of Pathology, RIPAS Hospital, Bandar Seri Begawan, Brunei Darussalam. 3. Department of Radiology, RIPAS Hospital, Bandar Seri Begawan, Brunei Darussalam. 4. PAPRSB Institute of Health Sciences, Universiti Brunei Darussalam, Bandar Seri Begawan, Brunei Darussalam.