1. School of Medicine, Department of Public Health; Pontificia Universidad Católica de Chile; Santiago Chile
2. School of Medicine, Department of Family Medicine; Pontificia Universidad Católica de Chile; Santiago Chile
3. School of Medicine, Nursing School; Pontificia Universidad Católica de Chile; Santiago Chile
4. Research Department; National Service for Prevention and Rehabilitation of Drug and Alcohol Consumption; Santiago Chile
5. Department of Emergency Medicine, UC Davis School of Medicine; Violence Prevention Research Program; Sacramento CA USA
6. Columbia University School of Public Health; New York NY USA
7. School of Medicine, Center for Study of Addiction; Pontificia Universidad Catolica de Chile; Santiago Chile