Funding for this research was provided by:
Departamento de Investigaciones Científicas y Tecnológicas, Universidad de Santiago de Chile (061641CF)
Text and Data Mining valid from 2018-10-29
Received: 23 July 2018
Accepted: 17 October 2018
First Online: 29 October 2018
Compliance with ethical standards
: The authors declare that they have no conflicts of interest.