1. Marketing & Sales Research Group, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
2. Louisiana State University, E. J. Ourso College of Business, Baton Rouge, LA, USA
3. University of Houston, C.T. Bauer College of Business, Houston, TX, USA
4. Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
5. Bringing Technology to Market Center, ESMT Berlin, Berlin, Germany