1. Faculty of Medicine; Department of Biomedical Science; University of Malaya; Kuala Lumpur Malaysia
2. Health Services Research; Singapore General Hospital; Singapore Singapore
3. Department of Clinical Research; Singapore General Hospital; Singapore Singapore
4. Faculty of Medicine; Department of Medicine; University of Malaya; Kuala Lumpur Malaysia
5. Island Hospital; Pulau Pinang; George Town Malaysia
6. Department of Neurology; Hospital Pulau Pinang; Penang Malaysia
7. Department of Neurology; Hospital Kuala Lumpur; Kuala Lumpur Malaysia
8. Hospital University Kebangsaan Malaysia; Kuala Lumpur Malaysia
9. Department of Medicine; Hospital Sultanah Nur Zahirah; Kuala Terengganu Malaysia
10. Department of Neurology; Singapore General Hospital; Singapore Singapore
11. National Neuroscience Institute and Duke-NUS Graduate Medical School; Singapore