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    The story 'A voice for the voiceless' (Nature 489, 461–463; 2012) incorrectly stated that the US National Postdoctoral Association (NPA) is working with the Association of Public Land-grant Universities to develop a certification programme. The NPA is developing the programme on its own but will seek support and input from the university association.

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    The online version of the original article can be found at 10.1038/nj7416-461a

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    Correction. Nature 490, 301 (2012) doi:10.1038/nj7419-301b

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