'At times he would ask me to inject'

HOUSTON, TX - SEPTEMBER 27:  Alex Rodriguez #13 of the New York Yankees works out on the field before the game against the Houston Astros at Minute Maid Park on September 27, 2013 in Houston, Texas.  (Photo by Scott Halleran/Getty Images)

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    'At times he would ask me to inject'

The former chief of Biogenesis tells "60 minutes" he injected Alex Rodriguez with banned substances.