1. Collaborative Innovation Center of Sichuan for Elderly Care and Health, Chengdu Medical College, Chengdu, Sichuan, China (mainland)
2. Sleep Medicine Center, Department of Respiratory and Critical Care Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan, China (mainland)
3. Hospital Affiliated to Southwest Medical University, Luzhou, Sichuan, China (mainland)