- Received December 18, 2014.
- Accepted February 24, 2015.
- Published online March 18, 2015.
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© 2015 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
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- 1The Wellcome Trust Centre for Neuroimaging, Institute of Neurology, Queen Square, London, UK
- 2Biology Department, Center for Regenerative and Developmental Biology, Tufts University, Medford, USA
- 3Institute of Cognitive Sciences and Technologies, National Research Council, Rome, Italy