1. China Center for Health Development Studies, Peking University, Beijing 100191, China
2. School of Management, Beijing University of Chinese Medicine, Beijing 100029, China
3. State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, Taipa 999078, China
4. Office of Policy and Planning Research, Chinese Center for Disease Control and Prevention, Beijing 102206, China