1. Division of Neurology, Department of Medicine, Faculty of Medicine; University of Malaya; Kuala Lumpur Malaysia
2. Department of Biomedical Science, Faculty of Medicine; University of Malaya; Kuala Lumpur Malaysia
3. Department of Medicine; Hospital Queen Elizabeth; Kota Kinabalu Sabah Malaysia
4. Department of Pathology, Faculty of Medicine; University of Malaya; Kuala Lumpur Malaysia