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Authors
Gañán-Calvo, A. M.
López-Herrera, J. M.
Rebollo-Muñoz, N.
Montanero, J. M.
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Article History
Received: 24 May 2016
Accepted: 5 August 2016
First Online: 1 September 2016
Competing interests
: The authors declare no competing financial interests.
