2[1]Hernan MA, Okek M J, Aseherion A. Cigaretter smoking and incidence of multiple sclerosis[J]. Am J Epidemiol, 2001,154:69～74
3[2]Casetta I, Granieri E, Malagu S, et al. Environmental risk factors and multiple sclerosis: a communitybased, case-control study in the province of Ferrara,Italy[J]. Neuroepidemiology, 1994,13:120～ 128
4[3]Emre M, de Decker C. Effects of cigarette smoking on motor functions in patients with multiple sclerosis[J]. Arch Neurol, 1992,49:1243～1247
5[4]Sriram S, Stratton CW, Song-Yi Y, et al. Chlamydia pneumoniae infection of the central nervous system in multiple sclerosis[J]. Ann Neurol, 1999,46:6～14
6John HN, Claudia L, Moses R, et al. N Engl J Med,20(~0,343:938.
7Polman CH. BMJ,2000,321:490.
8Neuhaous O, Farina C, Yassouridis A, et al. Proc Nail Acad Sci USA,2000, 97 : 7452.
9Oliver N, Clithia F, Hartmut W, et al. Neurology,2001,56:702.
10Nicola D, Sridar N, Gordon S, et al. Arch Neurol, 2001,58:65.
