1. Department of Economics and Management, University of Parma, Via J.F. Kennedy 6, Parma 43125, Italy
2. ICRIOS, Bocconi University, Via G. Roengten 1, Milan 20136, Italy
3. School of Management and Economics, University of Electronic Science and Technology of China, No. 2006, Xiyuan Avenue, Chengdu 611731, China
4. Department of Management and Technology, Bocconi University, Via G. Roengten 1, Milan 20136, Italy