Funding for this research was provided by:
Ministerio de Economía y Competitividad (ES) (CTQ2016-80847-R)
Consellería de Cultura, Educación e Ordenación Universitaria, Xunta de Galicia (GRC2013-032, AGRUP2015/02)
Article History
First Online: 5 July 2018
Compliance with ethical standards
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: The authors declare that they have no conflict of interest.