1. Department of Sleep Medicine, Mental Health Center of Shanou University, Shantou, China;
2. Sleep Medicine Center, Shantou University Medical College, Shantou, China;
3. Laboratory of Human Virology and Oncology, Shantou University Medical College, Shantou, Guangdong, China;
4. Sleep Research & Treatment Center, Department of Psychiatry, Pennsylvania State University, College of Medicine, Penn State Health Milton S. Hershey Medical Center, Hershey, Pennsylvania