1. Sleep duration and mortality;Gallicchio;A systematic review and meta-analysis,2009
2. Long sleep duration;Stamatakis;A risk to health or a marker of risk?,2007
3. Correlates of short and long sleep duration;Stranges;A cross-cultural comparison between the United Kingdom and the United States: The Whitehall II Study and the Western New York Health Study,2008
4. Hypnotics, sleep, and mortality in elderly people;Rumble;J Am Geriatr Soc,1992
5. Correlates of long sleep duration;Patel;Sleep,2006