Gillian Kolla1, Zoë Dodd2, Jen Ko2, Nick Boyce3, Sarah Ovens4. 1. Dalla Lana School of Public Health, University of Toronto, Toronto, ON M5T 3M7, Canada; Toronto Overdose Prevention Society, Toronto, ON, Canada. Electronic address: gillian.kolla@utoronto.ca. 2. Toronto Overdose Prevention Society, Toronto, ON, Canada; Moss Park Overdose Prevention Site, South Riverdale Community Health Centre, Toronto, ON, Canada. 3. Toronto Overdose Prevention Society, Toronto, ON, Canada; Ontario Harm Reduction Network, Toronto, ON, Canada. 4. Toronto Overdose Prevention Society, Toronto, ON, Canada; All Saints Church Community Centre, Toronto, ON, Canada.