1. Department of Research & Evaluation; Kaiser Permanente Southern California; Pasadena CA USA
2. Kaiser Permanente Center for Effectiveness & Safety Research; Pasadena CA USA
3. Institute for Health Research; Kaiser Permanente Colorado; Denver CO USA
4. The Center for Health Research; Kaiser Permanente Northwest; Portland OR USA
5. The Center for Health Research; Kaiser Permanente Hawaii; Honolulu HI USA