**Author details**

Célio A.A. Sousa1,2,3 and João M.S. Carvalho4,5\*

1 N2i Research Group, Polytechnic Institute of Maia, Maia, Portugal

2 UNICES Research Group, University of Maia, Portugal

3 NECE Research Group, Beira Interior University, Portugal

4 REMIT, Portucalense University, Porto, Portugal

5 CICS.NOVA—CEG/Open University, Portugal

\*Address all correspondence to: joao.carvalho@upt.pt

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