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t-test with inverse variance weighting in R

Manuel Spínola 
Dear list members,

I have 4 estimates (each estimate have its se or variance), 2 from 
treatment units and 2 from control units.  I want to do a t-test with 
inverse variance weighting to compare treatment vs control units.
Does anybody knows if there is an R function to do this type of analysis?
I am trying to get the confidence interval of the difference (I am not 
interested in the t and P values).
Thank you very much in advance.
Best,

Manuel Sp?nola