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<http://www.huffingtonpost.co.uk/2011/01/05/get-a-move-on-faster-walkers-live-longer-say-experts_n_7412996.html>
<http://www.huffingtonpost.co.uk/2011/01/05/get-a-move-on-faster-walkers-live-longer-say-experts_n_7412996.html>