[R] Get significant codes from a model output fit with GEE package

[david oseguera montiel]

Does anyone know how could I get the significant codes from mixed model 
output fitted with a GEE package?
The output I got is the following:

  GEE:  GENERALIZED LINEAR MODELS FOR DEPENDENT DATA
  gee S-function, version 4.13 modified 98/01/27 (1998)

Model:
  Link:                      Logit
  Variance to Mean Relation: Binomial
  Correlation Structure:     Exchangeable

Call:
gee(formula = bru ~ +grac + locc + dekc, id = flo, data = all,
     family = binomial(link = "logit"), corstr = "exchangeable")

Summary of Residuals:
         Min          1Q      Median          3Q         Max
-0.41935925 -0.15355800 -0.09403907 -0.03244056  0.98117731


Coefficients:
                          Estimate    Naive S.E.    Naive z      Robust 
S.E.  Robust z
(Intercept) -0.3254043  0.1640277 -1.983837   0.1375856 -2.365105
graczero    -1.6884041  0.4978737 -3.391230   0.5222118 -3.233179
loccM       -1.3815591  0.2202543 -6.272563   0.2256275 -6.123185
dekclow     -0.5583225  0.2487267 -2.244723   0.2293527 -2.434341

Estimated Scale Parameter:  1.025636

I much appreciate any help.
David