1. Department of Mechanical Engineering, University of Hong Kong, Hong Kong SAR, China
2. School of Energy and Environment, City University of Hong Kong, Hong Kong SAR, China
3. Key Laboratory of Green Built Environment and Energy Efficient Technology, Beijing University of Technology, Beijing, China
4. Institute of Public Safety Research, Department of Engineering Physics, Tsinghua University, Beijing, China
5. School of Public Health, University of Hong Kong, Hong Kong SAR, China