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Robin Roberts (C) gives a thumbs up as she discusses her medical condition with Diane Sawyer (L) and Sally Ann Roberts on ABC’s ”Good Morning America” program in this handout photo released June 11, 2012 (Credit: Reuters/Ida Mae Astute/ABC/Handout)

Robin Roberts (C) gives a thumbs up as she discusses her medical condition with Diane Sawyer (L) and Sally Ann Roberts on ABC's ''Good Morning America'' program in this handout photo released June 11, 2012 (Credit: Reuters/Ida Mae Astute/ABC/Handout)