1. 1 Department of Epidemiology, University of Alabama at Birmingham
2. 2 Department of Research & Evaluation, Kaiser Permanente Southern California, Pasadena
3. 3 Institute for Health Research, Kaiser Permanente Colorado, Aurora; Department of Epidemiology, Colorado School of Public Health, Aurora
4. 4 Chemical Dependency Treatment Services, Colorado Permanente Medical Group, Aurora
5. 5 Bernard J. Tyson School of Medicine, Pasadena, California (Binswanger)
6. 6 Department of Clinical Analysis, Southern California Permanente Medical Group, Pasadena
7. 7 Regional Reference Laboratories, Southern California Permanente Medical Group, Chino Hills