3R doll. Uncovering the effects of smoking: historical perspective[ J]. Stat Methods Med Res, 1998,7(2) :87-117.
4Scientific Committee on Tobacco and Health . Update of evidence on health effects of secondhand smoke[ M ]. London: Scientific Commit- tee on Tobacco and Health,2004.
5Frieden TR, Myers JE, Krauskopf MS. A public health approach to winning the war against cancer[ J ]. on cologist, 2008,13 C 12 ) : 1306- 1313.