About the Authors

C. Mary Schooling

Affiliation Department of Community Medicine and School of Public Health, The University of Hong Kong, Hong Kong SAR, China

Sun Wenjie

Affiliation Department of Community Medicine and School of Public Health, The University of Hong Kong, Hong Kong SAR, China

Sai Yin Ho

Affiliation Department of Community Medicine and School of Public Health, The University of Hong Kong, Hong Kong SAR, China

Wai Man Chan

Affiliation Department of Health, The Government of the Hong Kong Special Administrative Region, Hong Kong SAR, China

May Ked Tham

Affiliation Department of Health, The Government of the Hong Kong Special Administrative Region, Hong Kong SAR, China

Kin Sang Ho

Affiliation Department of Health, The Government of the Hong Kong Special Administrative Region, Hong Kong SAR, China

Gabriel M. Leung

gmleung@hku.hk

Affiliation Department of Community Medicine and School of Public Health, The University of Hong Kong, Hong Kong SAR, China

Tai Hing Lam

Affiliation Department of Community Medicine and School of Public Health, The University of Hong Kong, Hong Kong SAR, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: GL CS TL WC MT KH. Analyzed the data: CS WS. Contributed reagents/materials/analysis tools: WC MT KH. Wrote the paper: CS. Other: Critically reviewed the paper for important intellectual content: WS KH SH WC MT TL GL.