Repositorio Institucional de la Universidad de Oviedo

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This work was supported by the National Drugs Plan (Plan Nacional Sobre Drogas, PNSD) of the Ministry of Health, Social Services and Equality (Ref: MSSSI-12-2012/131), and by the Ministry of Economy and Competitiveness (MINECO-15-PSI2014-56114-P). All authors contributed in a significant way to the manuscript and all authors have read and approved the final manuscript. The authors declare no conflicts of interest.