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Correlates of short and long sleep duration : a cross-cultural comparison between the United Kingdom and the United States. The Whitehall II study and the Western New York health study
Stranges, Saverio.  American Journal of Epidemiology.  v. Vol.168. no. No.12.   2008-12-15. p. 1353 - 1364... issn: 0002-9262 .   

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