1. Institute of Human Genomic Study, College of Medicine Korean University Ansan Hospital Ansan South Korea
2. Department of Biomedical Informatics University of Utah School of Medicine Salt Lake City Utah USA
3. Center for Sleep and Circadian Neurobiology, Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania USA
4. Division of Sleep Medicine, Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania USA
5. School of Nursing University of Pennsylvania Philadelphia Pennsylvania USA
6. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, College of Medicine Korea University Seoul South Korea