1. School of Management, Lanzhou University, Lanzhou, People’s Republic of China
2. Evidence Based Social Science Research Center, School of Public Health, Lanzhou University, Lanzhou, People’s Republic of China
3. School of Public Management, Gansu University of Political Science and Law, Lanzhou, People’s Republic of China
4. Evidence Based Medicine Center, School of Basic Medical Sciences, Lanzhou University, Lanzhou, People’s Republic of China