6Pickup J,Williams G,eds.Textbook of Diabetes[M]. 2nd edn. London: Blackwell, 1997,58.
7Armstrong DG, Lavery LA ,Harkless LB.Validation of a diabeticwound classification system. The contribution of depth , infection, and ischemia to risk of amputation[J]. Diabetes Care ,1998,21 (6): 8.
8Foster AVM, Edmonds ME. The simple staging system- a new diabetic foot classification validated to guide therapy [J].Neurodiab and DFSG of EASD Joint Meeting (Abstrcts Book) Hungary, 2002 , 112.
