About the Authors

Qing Pei

peiqing@hku.hk

Affiliations Department of Geography, The University of Hong Kong, Hong Kong, International Centre for China Development Study, The University of Hong Kong, Hong Kong

David D. Zhang

Affiliations Department of Geography, The University of Hong Kong, Hong Kong, International Centre for China Development Study, The University of Hong Kong, Hong Kong

Harry F. Lee

Affiliations Department of Geography, The University of Hong Kong, Hong Kong, International Centre for China Development Study, The University of Hong Kong, Hong Kong

Guodong Li

Affiliation Department of Statistics and Actuarial Science, The University of Hong Kong, Hong Kong

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: QP DDZ. Performed the experiments: QP DDZ. Analyzed the data: QP DDZ HFL GDL. Contributed reagents/materials/analysis tools: QP. Wrote the paper: QP.