1 Environmental Microbiome Engineering and Biotechnology Laboratory, Department of Civil Engineering, The University of Hong Kong, Hong Kong, China.
2 Department of Biomedical Informatics, Harvard Medical School, Boston, MA 02115.
3 Center for Communicable Disease Dynamics, Department of Epidemiology, Harvard T. H. Chan School of Public Health, Harvard University, Boston, MA 02115.
4 Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139.
5 Department of Microbial Ecology, Centre for Microbiology and Environmental Systems Science, University of Vienna, 1090 Vienna, Austria.
6 Environmental Microbiome Engineering and Biotechnology Laboratory, Department of Civil Engineering, The University of Hong Kong, Hong Kong, China; zhangt@hku.hk.