1. Department of Pediatrics Chinese PLA General Hospital Beijing 100583 China
2. Department of Neurology Jiang‐Xi Children's Hospital Jiangxi 330006 China
3. Department of Neurology Beijing Children's Hospital Beijing 100045 China
4. Department of Neurology Children's Hospital of Chongqing Medical University Chongqing 400014 China
5. The Beijing new century children's Hospital Beijing 100045 China
6. Departments of Medicine and Neurology Royal Melbourne Hospital University of Melbourne Melbourne Australia
7. Department of Medicine and Therapeutics Chinese University of Hong Kong Hong Kong China