1. School of Civil and Environmental Engineering, Nanyang Technological University, 639798 Singapore
2. Nanyang Environment & Water Research Institute, Nanyang Technological University, 637141 Singapore
3. Lee Kong Chian School of Medicine, Nanyang Technological University, 308232 Singapore
4. School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
5. Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China