1. Department of Health Service Management, Second Military Medical University, Shanghai 200433, China
2. Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, China
3. Yangpu Hospital, Tongji University School of Medicine, Shanghai 200090, China
4. Tongji University School of Medicine, Shanghai 200092, China
5. Tongji University College of Economic and Management, Shanghai 200092, China
6. Shanghai Medical Information Center, Shanghai Health Development Research Center, Shanghai 200031, China