Kaiser Permanente Northern California, Oakland, California, United States
Group Health Cooperative, Seattle, Washington, United States
Group Health Research Institute, Seattle, Washington, United States
Group Health Cooperative, Seattle, Washington, United States
Kaiser Permanente Southern California, Los Angeles, California, United States
Kaiser Permanente Washinton Health Research Institute, Seattle, Washington, United States
Group Health Research Institute, Seattle, Washington, United States
Group Health Research Institute, Seattle, Washington, United States
Kaiser Permanente of Colorado, Denver, Colorado, United States