1. College of Economics and Management, University of Aeronautics and Astronautics, Nanjing, Jiangsu, China
2. School of Economics, Qufu Normal University - Rizhao Campus, Rizhao, China
3. Key Laboratory of Ecological Prewarning, Protection and Restoration of Bohai Sea, Ministry of Natural Resources, School of Life Sciences, Shandong University, Qingdao, China
4. Information Center, Zhejiang Nonferrous Geological Environmental Research Institute, Shaoxing, Zhejiang, China