1. Department of Sleep Center, Fujian Provincial Hospital, Shengli Clinical Medical College, Fujian Medical University , Fuzhou , China
2. Department of Psychiatry, Faculty of Medicine, The Chinese University of Hong Kong , Hong Kong , China
3. Li Chiu Kong Family Sleep Assessment Unit, Department of Psychiatry, Faculty of Medicine, The Chinese University of Hong Kong , Hong Kong , China
4. Center for Sleep and Circadian Medicine, The Affiliated Brain Hospital of Guangzhou Medical University , Guangzhou , China