1. Multiple Sclerosis Center, Department of Neurology, the Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China.
2. Centre for Neuromuscular and Neurological Disorders, University of Western Australia, and Department of Neurology, Sir Charles Gairdner Hospital, Queen Elizabeth II Medical Centre, Perth, Australia.
3. Centre for Clinical Immunology and Biomedical Statistics, Murdoch University and Royal Perth Hospital, Perth, Australia.