1. Brendan Jacka, Stine Hoj, and Julie Bruneau are with Research Center of the Centre Hospitalier de l’Université de Montréal, Montréal, Quebec. Canada. Sarah Larney and Louisa Degenhardt are with National Drug and Alcohol Research Centre, UNSW Sydney, NSW, Australia. Naveed Janjua and Mel Krajden are with British Columbia Centres for Disease Control, Vancouver, British Columbia, Canada. Jason Grebely is with The Kirby Institute, UNSW Sydney.