1 Division of Neurology and the Mah Pooi Soo & Tan Chin Nam Centre for Parkinson's & Related Disorders, University of Malaya, Kuala Lumpur, Malaysia.
2 Pediatric Neurology Unit, Yangon Children's Hospital, Yangon, Myanmar.
3 Department of Medical Microbiology, University of Malaya, Kuala Lumpur, Malaysia.
4 Division of Neurology and the Mah Pooi Soo & Tan Chin Nam Centre for Parkinson's & Related Disorders, University of Malaya, Kuala Lumpur, Malaysia. Electronic address: limshenyang@ymail.com.