1. The Permanente Medical Group; Oakland CA
2. The Department of Emergency Medicine; Kaiser Permanente, San Rafael Medical Center; San Rafael CA
3. The Kaiser Permanente Division of Research; Oakland CA
4. The Department of Emergency Medicine; South San Francisco Medical Center; San Francisco CA
5. The Department of Emergency Medicine; South Sacramento Medical Center; Sacramento CA
6. The Department of Emergency Medicine; Oakland Medical Center; Oakland CA
7. The Department of Emergency Medicine; Roseville Medical Centers; Roseville CA