6LIU B Q, PETO R, CHEN Z M, et al. Emerging tobacco ha- zards in China: 1.Retrospective proportional mortality study of one million deaths[J]. BMJ, 1998,317 : 1411-1422.
7EZZATI M, LOPE A D. Estimates of global mortality attri- butable to smoking in 2000[J]. Lancet, 2003,362:847-852.