About the Authors

Fangxia Shen

Affiliation State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, China

Maosheng Yao

yao@pku.edu.cn

Affiliation State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MY. Performed the experiments: FS. Analyzed the data: FS MY. Wrote the paper: FS MY.