1. Institute of Medical Education, Peking University, No. 38 Xueyuan Road, Beijing 100191, China
2. National Center for Health Professions Education Development, Peking University, No. 38 Xueyuan Road, Beijing 100191, China
3. School of Software and Microelectronics, Peking University, No.5 Yiheyuan Road, Beijing 100871, China
4. School of Nursing, Peking University, No. 38 Xueyuan Road, Beijing 100191, China