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Will injuries force Tiger Woods' retirement? He's been plagued by a litany of injuries — the ailing back that sent him packing Thursday is not new.

Saving Dr. Brantly, Part 6 Saving Dr. Brantly, Part 6 Saving Dr. Brantly, Part 6
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Saving Dr. Brantly, Part 6

Saving Dr. Brantly, Part 5 Saving Dr. Brantly, Part 5 Saving Dr. Brantly, Part 5
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Saving Dr. Brantly, Part 5

Saving Dr. Brantly, Part 4 Saving Dr. Brantly, Part 4 Saving Dr. Brantly, Part 4
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Saving Dr. Brantly, Part 4

Saving Dr. Brantly, Part 3 Saving Dr. Brantly, Part 3 Saving Dr. Brantly, Part 3
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Saving Dr. Brantly, Part 3

Saving Dr. Brantly, Part 2 Saving Dr. Brantly, Part 2 Saving Dr. Brantly, Part 2
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Saving Dr. Brantly, Part 2

NBC NEWS SPECIAL: Saving Dr. Brantly NBC NEWS SPECIAL: Saving Dr. Brantly NBC NEWS SPECIAL: Saving Dr. Brantly
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NBC NEWS SPECIAL With Matt Lauer: Saving Dr. Brantly

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