About the Authors
Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing, People's Republic of China
The authors have declared that no competing interests exist.
Conceived and designed the experiments: ZZ JZ WW. Performed the experiments: ZZ WW ZS. Analyzed the data: ZZ WW ZS. Contributed reagents/materials/analysis tools: ZZ LW. Wrote the paper: ZZ.