1. University of Pennsylvania School of Nursing; Philadelphia PA USA
2. Center for Sleep and Circadian Neurobiology; Perelman School of Medicine; University of Pennsylvania; Philadelphia PA USA
3. Division of Sleep Medicine; Department of Medicine; University of Pennsylvania; Philadelphia PA USA
4. Division of Cardiology; University of Pennsylvania; Philadelphia PA USA
5. Institute of Human Genomic Study; College of Medicine; Korean University Ansan Hospital; Ansan Korea
6. Division of Pulmonary and Critical Care Medicine; Department of Internal Medicine; Korea University; Ansan Korea