1. School of Public Policy and Administration, Xi’an Jiaotong University, Xi’an 710049, China
2. International Centre for Reproductive Health, Ghent University, 9000 Ghent, Belgium
3. Vanke School of Public Health, Tsinghua University, Beijing 100084, China
4. School of Public Health and Emergency Management, Southern University of Science and Technology, Shenzhen 518055, China