About the Authors

Hairong Nan

Affiliation Department of Community Medicine, School of Public Health, Li Ka Shing Faculty of Medicine, The University of Hong Kong, SAR China

Paul H. Lee

Affiliation Department of Community Medicine, School of Public Health, Li Ka Shing Faculty of Medicine, The University of Hong Kong, SAR China

Michael Y. Ni

Affiliation Department of Community Medicine, School of Public Health, Li Ka Shing Faculty of Medicine, The University of Hong Kong, SAR China

Brandford H. Y. Chan

Affiliation Department of Community Medicine, School of Public Health, Li Ka Shing Faculty of Medicine, The University of Hong Kong, SAR China

Tai-Hing Lam

hrmrlth@hku.hk

Affiliation Department of Community Medicine, School of Public Health, Li Ka Shing Faculty of Medicine, The University of Hong Kong, SAR China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: THL HN. Performed the experiments: PHL HN BYC. Analyzed the data: HN PHL MYN. Wrote the paper: HN PHL MYN BYC THL.