Funding for this research was provided by:
Ministerio de Educación, Cultura y Deporte (ENE2014-57977-C2-1-R)
U.S. Department of Defense (W911NF-14-1-0046)
Article History
Received: 14 June 2016
Accepted: 17 October 2016
First Online: 27 October 2016
Compliance with ethical standards
:
: The authors declare that they have no competing interests.