Repositorio Institucional de la Universidad de Oviedo

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TO would like to thank Angel Uranga for very useful conversations. This work has been supported in part by the Spanish Government grants FPA2012-35043-C02-01 and FPA2015-66793-P (MINECO/FEDER, UE), the Centro de Excelencia Severo Ochoa Program grant SEV-2012-0249 and the Spanish Consolider-Ingenio 2010 program CPAN CSD2007-00042. The work of PAC was supported by a "la Caixa-Severo Ochoa" International pre-doctoral grant. The work of PFR was supported by the Severo Ochoa pre-doctoral grant SVP-2013-067903. TO wishes to thank M.M. Fernandez for her permanent support.