Jie Gu
Department of International Medical Center, Zhongshan Hospital, Fudan University, Shanghai, China

Chenxi Liu
School of Medicine and Health Management, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China

Jiangmei Qin
China National Health Development Research Center, Beijing, China

Yang Wang
Shanghai General Practice and Community Health Development Research Center, Shanghai, China; Department of General Practice, Yangpu Hospital Affiliated to Tongji University, Shanghai, China

Chuan Zou
Department of Family Medicine, the Fifth People's Hospital, Chengdu University of Traditional Chinese Medicine, Chengdu, China

Yang Zhao
Duke-NUS Medical School, National University of Singapore, Singapore