1. Kaitong Liang, School of Intellectual Property & Centre for Innovation and Development, Nanjing University of Science and Technology, Nanjing, P R China.
2. Lei Ma (corresponding author), School of Public Affairs & School of Intellectual Property, Nanjing University of Science and Technology, Nanjing, P R China.
3. Zheng Liu, Cardiff School of Management, Cardiff Metropolitan University, Wales, UK; Centre for Innovation and Development, Nanjing University of Science and Technology, Nanjing, P R China.
4. Tao Li, School of Intellectual Property & Centre for Innovation and Development, Nanjing University of Science and Technology, Nanjing, P R China.