**Author details**

José Moleiro Martins1 \*, António Abreu2 and João Calado3

\*Address all correspondence to: zdmmartins@gmail.com

1 Polytechnic Institute of Lisbon, Business Research Unit (BRU-IUL)/ISCTE-IUL, Lisbon, Portugal

2 Mechanical Engineering Department, ISEL—Instituto Superior de Engenharia de Lisboa/CTS—Uninova, Lisbon, Portugal

3 Mechanical Engineering Department, ISEL—Instituto Superior de Engenharia de Lisboa/IDMEC-LAETA-IST-UL, Lisbon, Portugal
