1. Dept. of Product and Production Development, Chalmers Univ. of Technology, SE-41296 Gothenburg, Sweden (corresponding author).
2. Professor, Dept. of Product and Production Development, Chalmers Univ. of Technology, SE-41296 Gothenburg, Sweden.
3. Associate Professor, Dept. of Product and Production Development, Chalmers Univ. of Technology, SE-41296 Gothenburg, Sweden.