1. Department of Psychiatry University of Pennsylvania Philadelphia PA USA
2. Department of Biostatistics, Epidemiology and Informatics University of Pennsylvania Philadelphia PA USA
3. Department of Psychological Sciences University of Arkansas Fayetteville AR USA
4. Department of Psychiatry and Behavioral Sciences Stanford University Palo Alto CA USA
5. Department of Psychiatry University of Arizona Tucson AZ USA
6. Department of Medicine University of Pennsylvania Philadelphia PA USA
7. Department of Psychology East Carolina University Greenville NC USA
8. Department of Psychology University of Arizona Tucson AZ USA
9. Northumbria Center for Sleep Research Northumbria University Newcastle UK