Herrera-Yagüe, C.
Schneider, C. M.
Couronné, T.
Smoreda, Z.
Benito, R. M.
Zufiria, P. J.
González, M. C.
Article History
Received: 23 October 2014
Accepted: 2 April 2015
First Online: 2 June 2015
Competing interests
: The authors declare no competing financial interests.