1. School of Management, Shenyang Jianzhu University, Shenyang, P. R. China
2. Department of Systems Engineering and Operations Research, George Mason University, Fairfax, VA, USA
3. School of Medicine and Health Management, Guizhou Medical University, Guiyang, Guizhou, P. R. China
4. Information Center, The First Affiliated Hospital of Dalian, Medical University, Dalian, P. R. China