1. Department of Sleep Medicine, Shantou University Mental Health Center, Shantou University Medical College, Shantou, Guangdong, China
2. Sleep Medicine Center, Shantou University Medical College, Shantou, Guangdong, China
3. Sleep Research and Treatment Center, Department of Psychiatry and Behavioral Health, Pennsylvania State University, College of Medicine, Hershey, Pennsylvania
4. Department of Psychiatry and Behavioral Sciences, University of Crete, Heraklion, Crete, Greece
5. Sleep Medicine Center, Mental Health Center, West China Hospital, Sichuan University, Chengdu, China