Robin Roberts is back on ABC's Good Morning America.  The popular anchorwoman left the morning news program nearly six months ago to begin treatment for a rare blood disorder. Roberts had a bone marrow transplant last September. 

She told her audience this morning that she's thankful and a bit relieved to be back to work on the network's top-rated morning show. 

Doctors believe Roberts came down with the disorder when she was being treated for breast cancer several years ago. 

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