1. Department of Pulmonary Medicine; Beijing University People's Hospital; Beijing; China
2. Stanford Center for Sleep Sciences and Medicine; Palo Alto; CA; USA
3. Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine; Case Western Reserve University, and Cleveland Louis Stokes VA Medical Center; Cleveland; OH; USA
4. BFR Diagnostics LTD; Beijing; China
5. Department of Human Genetics; University of Tokyo; Tokyo; Japan