1. Department of Accident and Emergency, Yan Chai Hospital, Hong Kong SAR, China
2. Clinical Research Centre, Kowloon West Cluster, Hospital Authority, Hong Kong SAR, China
3. Division of Neurology, Department of Medicine and Geriatrics, Caritas Medical Centre, Hong Kong SAR, China
4. Department of Accident and Emergency, Caritas Medical Centre, Hong Kong SAR, China
5. Department of Accident and Emergency, North Lantau Hospital, Hong Kong SAR, China
6. Division of Neurology, Department of Medicine and Geriatrics, Princess Margaret Hospital, Hong Kong SAR, China