Alert, Ricard https://orcid.org/0000-0002-1885-9177
Tierno, Pietro https://orcid.org/0000-0002-0813-8683
Casademunt, Jaume
Article History
Received: 11 April 2016
Accepted: 1 September 2016
First Online: 7 October 2016
Competing interests
: The authors declare no competing financial interests.