1 Prevention Research Collaboration, Sydney School of Public Health, Faculty of Medicine and Health, The University of Sydney, Camperdown, NSW 2006, Australia; Charles Perkins Centre, The University of Sydney, Camperdown, NSW, Australia. Electronic address: melody.ding@sydney.edu.au.
2 Physical Activity for Health Research Centre, Institute for Sport, Physical Education and Health Sciences, University of Edinburgh, Edinburgh, UK.
3 Prevention Research Collaboration, Sydney School of Public Health, Faculty of Medicine and Health, The University of Sydney, Camperdown, NSW 2006, Australia; Charles Perkins Centre, The University of Sydney, Camperdown, NSW, Australia.
4 Institute for Public Health, Department of Family Medicine and Public Health, University of California San Diego, La Jolla, CA, USA.
5 Postgraduate Program in Epidemiology, Federal University of Pelotas, Bairro Centro-Pelotas, Brazil.