1. Applied Social Science Group, Department of Public Health and Primary Care, The University of Cambridge, Forvie Site, Cambridge CB2 0SR, UK
2. School of Nursing, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand
3. School of Foreign Studies and School of International Culture, South China Normal University, Guangzhou, China
4. School of Population Health, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand