2A me riean Psychiatric Association.Diagnostic and statistical manul of mental disorders(DS M-IV).4th ed.Washington:A merican Psychi-attic Association,1994.143-147.
3Romrn GC.The epidemiology of vascular dementia.Handb Clin Neurol,2008,89:639-658.
4Suu QQ,Xu SS,Pan JL,et al.Huperzine a capsules enhance lnenlol'y and learning perfor mance in 34 pairs of matched adoles-rant students.Zhong guo Yao li Xuebao,1999,20(7):601-603.