Funding for this research was provided by:
Ministerio de Economía y Competitividad (SAF2016-77830-R, BFU2016-64405-R, SAF2015-74627-JIN)
European Regional Development Fund (BFU2015-64405-R)
National Institute on Drug Abuse (Intramural)
Received: 19 October 2017
Accepted: 22 January 2018
First Online: 28 February 2018
Ethics approval and consent to participate
: Not applicable.
: The authors declare that they have no competing interests.
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