Funding for this research was provided by:
Consejo Nacional de Ciencia y Tecnología, Paraguay (CVU 225254)
Spanish Government (CGL2013-46808-R)
Text and Data Mining valid from 2019-12-01
Received: 23 May 2019
Accepted: 14 November 2019
First Online: 4 December 2019
Consent for publication
: Not applicable.
: The authors declare that they have no competing interests.