CBS News video: One doctor's experience with ALS: His own -2|5|2012
Amyotrophic Lateral Sclerosis - commonly called Lou Gehrig's disease - is a rare but terrible disease. So what are the odds that one of our country's leading authorities on ALS would be struck down by it himself? John Blackstone has a follow-up to the visit he paid to a very brave and very determined physician.
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