1. Munich School of Management, Ludwig Maximilian University (LMU), Kaulbachstrasse 45/1, Munich, 80539, Germany
2. Carl von Ossietzky University of Oldenburg, Ammerländer Heerstr. 114-118, Oldenburg, 26129, Germany
3. C.T. Bauer College of Business, University of Houston, 4250 Martin Luther King Blvd, Houston, Texas, 77204-6021, USA
4. Sales Management Department, University of Bochum, Universitätsstrasse 150, Bochum, 44780, Germany