1. Associate Professor, Social Sciences Group, Wageningen University, Hollandseweg 1, 6706 KN Wageningen, the Netherlands.
2. Assistant Professor, Economics of Technology and Innovation Group, Delft University, Jaffalaan 5, 2628 BX Delft, the Netherlands.
3. Assistant Professor, Centre for Sustainable Entrepreneurship, University of Groningen, Sophialaan 1, 8911 AE Leeuwarden, the Netherlands.