1. School of Public Health, Lanzhou University, Lanzhou, China
2. Institute of Hospital Management, West China Hospital of Sichuan University, Chengdu, China
3. Evidence Based Medicine Center, School of Basic Medical Sciences, Lanzhou University, Lanzhou, China
4. Office of Legal Affairs, Gansu Provincial Hospital, Lanzhou, China
5. Finance Department of Gansu provincial maternity and child-care hospital, Lanzhou, China
6. Department of Radioimaging, Gansu Provincial Hospital of TCM, Lanzhou, China