1. Sales and Marketing Department, University of Bochum, Universitätsstraße 150, 44780 Bochum, Germany
2. Hidden Champions Institute (HCI), ESMT European School of Management and Technology, Schlossplatz 1, 10178 Berlin, Germany
3. Sales and Marketing Department, Ruhr-University of Bochum, Bochum, Germany
4. Marketing and Retailing Department, Loughborough University, Loughborough, England