Funding for this research was provided by:
Ministry of Economy and Competitiveness of Spain and FEDER funds of the EU (Project TIN2013-42148-P, Predoctoral grant ref. BES-2014-068066)
Galician Government (Xunta de Galicia) under the Consolidation Program of Competitive Research Units, cofunded by FEDER funds of the EU (Ref. GRC2013/055)