1. The Permanente Medical Group, Division of Research; Kaiser Permanente Oakland, California USA
2. Department of Research and Evaluation; Kaiser Permanente Southern California; Pasadena California USA
3. Group Health Research Institute; Seattle Washington USA
4. HealthPartners Institute; Bloomington Minnesota USA
5. Kaiser Permanente Center for Health Research; Hawaii Honolulu, Hawaii USA
6. Center for Clinical and Outcomes Research; Kaiser Permanente Georgia Atlanta Georgia USA
7. Division of Public Health Sciences, Department of Epidemiology & Prevention, Wake Forest University Health Sciences; Winston-Salem North Carolina USA