R help - Oct 2012 - calculating gelman diagnostic for mice object

I am using -mice- for multiple imputation and would like to use the gelman
diagnostic in -coda- to assess the convergence of my imputations.  However,
gelman.diag requires an mcmc list as input.  van Buuren and
Groothuis-Oudshoorn (2011) recommend running mice step-by-step to assess
convergence (e.g.  imp2 <- mice.mids(imp1, maxit = 3, print = FALSE) )  but
this creates mids objects.  How can I convert the mids objects into an mcmc
list?  Or is the step-by-step approach wrong here?

thanks,
Rachel

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