García-Massó, X
Serra-Añó, P
Gonzalez, L M
Ye-Lin, Y
Prats-Boluda, G
Garcia-Casado, J
Article History
Received: 27 October 2014
Revised: 1 April 2015
Accepted: 14 April 2015
First Online: 19 May 2015
Competing interests
: The authors declare no conflict of interest.