Pink Power TODAY: Joan Lunden talks to Hoda Kotb about breast cancer

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In a live special event, viewer questions about breast cancer are fielded by Dr. Deepa Halaharvi, a surgeon and breast cancer survivor; NBC News medical contributor Dr. Natalie Azar, and TODAY special correspondent Joan Lunden, also a breast cancer survivor. Joan tells Hoda that she wished she had better understood breast cancer risk factors.