Funding for this research was provided by:
Fundação para a Ciência e a Tecnologia (PTDC/CTM-ENE/2391/2014)
Text and Data Mining valid from 2019-01-25
Received: 8 June 2018
Accepted: 14 December 2018
First Online: 25 January 2019
: The authors declare that they have no competing interests.
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