1. Ph.D. Researcher, Dept. of Industrial Systems Engineering and Product Design, Faculty of Engineering and Architecture, Ghent Univ., Technologiepark 903, 9052 Zwijnaarde, Belgium (corresponding author).
2. Professor, Dept. of Industrial Systems Engineering and Product Design, Faculty of Engineering and Architecture, Ghent Univ., Technologiepark 903, 9052 Zwijnaarde, Belgium.