1. David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA, USA
2. Division of Social and Behavioural Health, Dalla Lana School of Public Health, University of Toronto, Toronto, ON, Canada
3. Asociación Civil Vía Libre, Lima, Peru
4. Universidad Peruana Cayetano Heredia, Lima, Peru
5. Department of Population and Public Health Sciences, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
6. Division of Social and Behavioural Health, Dalla Lana School of Public Health, University of Toronto, 155 College Street, Toronto, ON, Canada, M5T 3M7