1. Key
Laboratory of Public Health Safety of Ministry of Education, School
of Public Health, Fudan University, Shanghai 200032, China
2. Minhang District Center for Disease Control and Prevention, Minhang District, Shanghai 201101, China
3. Changning District Center for Disease Control and Prevention, Changning District, Shanghai 200051, China
4. School
of Epidemiology, Public Health, and Preventive Medicine, Faculty of
Medicine, University of Ottawa, Ottawa, Ontario K1H8M5, Canada