1. Nottingham University Business School China, 199 Taikang East Road, Ningbo 315100, Zhejiang, China
2. Department of Geosciences and Resource Management, University of Copenhagen, Øster Voldgade 10, København K 3460, Denmark
3. Technical University of Denmark, Anker Engelunds Vej 1, Kgs. Lyngby 2800, Denmark