7Todd S. Perlstein, Richard T. Lee. Smoking, metalloproteinase,and vascular disease[J].Arterioscler Thromb Vasc Biol,2006, 26:250-256.
8Saverio S, Joan MD, Martin JS, et al.Correlates of short and long sleep duration: a cross-cultural comparison between the United Kingdom and the United States[J].American Journal of Epidemiology,2008, 168 : 1353-1364.