Robin Roberts returns to 'Good Morning America'

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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