3Phillips MR, Li XY, Zhang YP. Suicide rates in China 1995 -1999. Lancet, 2002, 359:835-840.
4Phillips MR, Yang GH, Zhang YP, et al. Risk factors for suicide in China: a national case- control psychological autopsy study. Lancet, 2002, 360: 1728 - 1736.
5John RH. Why does smoking so often produce dependence? A some what different view [J] . Tob Control, 2001, 10: 62-64.
7Fageratrom KO, Kunze M, Schoberberger R, et al. Nicotine dependence versus smoking prevalence: comparisons among countries and categories of smokers [ J ]. Tob Control, 1996,5:52- 56.
8Perez-Rios M,Santiago-Perez MI,Alonso B, ct al. Fagerstrom test for nicotine dependence vs heavy smoking index in a general population survey [ J 1. BMC Public Health,2009,9 : 493.
9Wu J, Yang T, Rockett IR, et al. Nicotine Dependence among rural-urban migrants in China[ J ]. BMC Public Health ,2011,11 : 296.
10Yang T, Shiffman SS, Rockett IR, et al. Nicotine dependence among Chinese city dwellers: a population-based cross-sectional study[ J]. Nicotine Tob Res,2011 , 13 : 556-564.