Can hackers target a pacemaker?

http://en.wikipedia.org/wiki/Artificial_cardiac_pacemaker

It seems, there are no devices, which are hacker-safe any longer — from ATMs, cars, smartphones to medical devices. Though, it may sound like a plot of a crime thriller, serious investigations and experiments have revealed that medical implants like — pacemakers and insulin pumps are vulnerable to cyber attacks that could endanger their users’ lives. 

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Story added 4. June 2012, content source with full text you can find at link above.