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Ohayon, Maurice M; Guilleminault, Christian; Chokroverty, Sudhansu (2010). «Sleep epidemiology 30 years later: Where are we?». Sleep Medicine. 11 (10): 961–2. PMID21084223. doi:10.1016/j.sleep.2010.10.001
Badran, Mohammad; Yassin, Bishr Abu; Fox, Nurit; Laher, Ismail; Ayas, Najib (2015). «Epidemiology of Sleep Disturbances and Cardiovascular Consequences». Canadian Journal of Cardiology. 31 (7): 873–9. PMID26037823. doi:10.1016/j.cjca.2015.03.011
Bixler, E. O; Kales, A; Soldatos, C. R; Kales, J. D; Healey, S (1979). «Prevalence of sleep disorders in the Los Angeles metropolitan area». American Journal of Psychiatry. 136 (10): 1257–62. PMID314756. doi:10.1176/ajp.136.10.1257
Ohayon, Maurice M; Guilleminault, Christian; Chokroverty, Sudhansu (2010). «Sleep epidemiology 30 years later: Where are we?». Sleep Medicine. 11 (10): 961–2. PMID21084223. doi:10.1016/j.sleep.2010.10.001