1 School of Public Health, Li KaShing Faculty of Medicine, University of Hong Kong, Hong Kong SAR, China and City University of New York School of Public Health and Hunter College, New York, USA School of Public Health, Li KaShing Faculty of Medicine, University of Hong Kong, Hong Kong SAR, China and City University of New York School of Public Health and Hunter College, New York, USA mschooli@hunter.cuny.edu.
2 School of Public Health, Li KaShing Faculty of Medicine, University of Hong Kong, Hong Kong SAR, China and City University of New York School of Public Health and Hunter College, New York, USA.