Funding for this research was provided by:
FINEP/CT-PETRO (2653/09 – 01.11.0091.00)
FAPERGS PqG 2017 (2551 - 000 11 57 - 0)
Text and Data Mining valid from 2019-08-13
Received: 9 October 2018
Accepted: 7 August 2019
First Online: 13 August 2019
Compliance with ethical standards
: The authors declare no conflict of interest.
: The founding sponsors had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, and in the decision to publish the results.