Published on in Vol 22, No 9 (2020): September
1 Department of Epidemiology and Biostatistics, School of Public Health, Peking University, Beijing, China
2 National Institute on Drug Dependence, Peking University, Beijing, China
3 Medical Informatics Center, Peking University, Beijing, China
4 College of Nursing and Health Sciences, University of Massachusetts Boston, Boston, MA, United States
5 Center for Drug Abuse Control and Prevention, National Institute of Health Data Science, Peking University, Beijing, China
6 Center for Intelligent Public Health, Institute for Artificial Intelligence, Peking University, Beijing, China
*these authors contributed equally