Institution: | 1. Centers for Disease Control and Prevention, Atlanta, GA, USA;2. Kaiser Permanente Washington Research Institute, Seattle, WA, USA;3. Institute for Health Research, Kaiser Permanente, Denver, CO, USA;4. Kaiser Permanente Northern California, Oakland, CA, USA;5. Denver Health, Denver, CO, USA;6. Marshfield Clinic Research Institute, Marshfield, WI, USA;7. Kaiser Permanente Southern California, Pasadena, CA, USA |