1 The Kirby Institute, UNSW Sydney, Sydney, NSW 2052, Australia; Centre for Social Research in Health, UNSW Sydney, Sydney, NSW 2052, Australia. Electronic address: amarshall@kirby.unsw.edu.au.
2 The Kirby Institute, UNSW Sydney, Sydney, NSW 2052, Australia; Department of Infectious Diseases, Prince of Wales Hospital, Sydney, NSW, Australia.
3 Centre de Recherche du Centre Hospitalier, l'Université de Montréal, Montréal, QC, Canada.
4 Centre for Social Research in Health, UNSW Sydney, Sydney, NSW 2052, Australia.
5 Centre de Recherche du Centre Hospitalier, l'Université de Montréal, Montréal, QC, Canada; Department of Family Medicine and Emergency Medicine, l'Université de Montréal, Montréal, QC, Canada.