About the Authors

Vincent C. H. Chung


Affiliation Jockey Club School of Public Health and Primary Care, Chinese University of Hong Kong, Hong Kong, Special Administrative Region, People's Republic of China

Polly H. X. Ma
Lau Chun Hong
Sian M. Griffiths

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: VCHC SMG. Performed the experiments: VCHC PHXM LCH SMG. Analyzed the data: VCHC PHXM LCH SMG. Contributed reagents/materials/analysis tools: VCHC PHXM LCH SMG. Wrote the paper: VCHC PHXM LCH SMG.