1. Division of Adolescent Medicine, Department of Pediatrics, Sainte-Justine University Hospital Centre, University of Montreal, Montreal, Canada
2. Harvard Graduate School of Arts and Sciences, Cambridge, Massachusetts, USA
3. Grayken Center for Addiction and Department of Pediatrics, Boston Medical Center, Boston, Massachusetts, USA
4. Division of General Pediatrics, Department of Pediatrics, Boston University School of Medicine, Boston, Massachusetts, USA