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Robin Roberts thanks viewers in video message

'Good Morning America' co-host Robin Roberts is seen in her hospital bed in this image taken September 2012.

September 20, 2012 12:00:00 AM PDT
Robin Roberts thanked viewers for their support in a video message as she faced a bone marrow transplant Thursday.

The "Good Morning America" co-anchor was seen from her New York hospital bed in the video.

"Thoughts are so powerful. You've got to change the way you think in order to change the way you feel," she said. "And let me just say this lastly, I feel the love and I thank you for it. Thank you."

Roberts' transplant comes after 11 days spent in the hospital and eight days of chemotherapy to prepare her for the procedure. Her donor is her older sister, Sally-Ann Roberts.

In June, Roberts revealed that she had myelodysplastic syndrome, or MDS, from complications from the breast cancer treatment she underwent five years ago.

It is not yet known when Roberts will return to the morning show, but she said she will return "as soon as I can."

ABC News and The Associated Press contributed to this report.