1. Department of Pediatrics, Stanford University School of Medicine, Stanford, CA, USA
2. Institute for Health Research, Kaiser Permanente Colorado, Denver, CO, USA
3. Department of Epidemiology, Colorado School of Public Health, Aurora, CO, USA
4. Division of General Internal Medicine and Division of Substance Dependence, University of Colorado School of Medicine, Aurora, CO, USA
5. Denver Health Medical Center, Denver, CO, USA
6. Santa Clara County Juvenile Custody Institutions, Santa Clara Valley Medical Center, San Jose, CA, USA