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Until last August, I was only an occasional blood donor. If the opportunity arose and it was convenient, then I¡¯d do it. But I never really set out to give blood. It was just something I did off and on starting in high school.

Then, in January 2013, my wife, Ever Goodie-Preston, was diagnosed with cancer. And, suddenly, blood donation became very important.

My wife was diagnosed with a rare...