Funding for this research was provided by:
Ministerio de Economia y Competitividad' of the Spanish Government and ERDF funds (RUNNER TEC2016-77148-C2-1-R)
Catalan Government (2014SGR-60)
Article History
Received: 11 July 2017
Accepted: 30 January 2018
First Online: 20 February 2018
Competing interests
: The authors declare that they have no competing interests.
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