1. Ph.D. Student, Faculty of Engineering, Univ. of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal (corresponding author).
2. Assistant Professor, Faculty of Engineering, Univ. of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.
3. Full Professor, Faculty of Engineering, Univ. of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.
4. Associate Professor, Faculty of Engineering, Univ. of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.