Funding for this research was provided by:
Ministerio de Economía, Industria y Competitividad, Gobierno de España (CTQ2013-45970-C2-1-R, PCIN-2013-021-C02-01)
Article History
Received: 20 June 2018
Revised: 19 September 2018
Accepted: 25 September 2018
First Online: 15 October 2018
Compliance with ethical standards
: This article does not contain any studies with human participants or animals performed by any of the authors.
: The authors declare that they have no conflict of interest.