Kaiser Permanente Northern California, Oakland, California, United States
VA Northern California Health Care System, Mather, California, United States
UC Davis Cancer Center, Sacramento, California, United States
Coordinating Center: University of California, Davis Medical Center, Department of Neurological Surgery, Sacramento, California, United States
University of Washington - Harborview Medical Center, Seattle, Washington, United States
Vanderbilt University Medical Center, Nashville, Tennessee, United States
University of California Davis Medical Center, Sacramento, California, United States
University of California, Davis General Clinical Research Center, Sacramento, California, United States
University of California, Davis, Medical Center, Sacramento, California, United States
Department of Family & Community Medicine, UC Davis School of Medicine, Sacramento, California, United States
University of California, Davis, Sacramento, California, United States
University of California, Davis, Sacramento, California, United States
Centerra Health, Norfolk, Virginia, United States
Johns Hopkins, Baltimore, Maryland, United States
University of California, Davis, Sacramento, California, United States
UC Davis General Medicine Research Clinic, Sacramento, California, United States