Text and Data Mining valid from 2018-05-02
Received: 29 August 2017
Revised: 23 January 2018
Accepted: 8 February 2018
First Online: 2 May 2018
: Mireia Morera, Jose Antonio Moreno Muñoz, and Montserrat Rivero are employees of ORDESA SL. Their role was to critically review the manuscript and were not involved in the statistical analysis or manuscript redaction. The remaining authors declare no conflict of interest.