1. Departments of Emergency Medicine and Critical Care; Kaiser Permanente; Oakland CA
2. Department of Radiology; Kaiser Permanente; Oakland CA
3. Department of Radiology; Kaiser Permanente; Santa Clara CA
4. Department of Emergency Medicine; New York University School of Medicine; New York NY
5. Department of Emergency Medicine; Kaiser Permanente; San Leandro CA
6. Department of Emergency Medicine; Kaiser Permanente; Roseville CA
7. Department of Emergency Medicine; Kaiser Permanente; San Rafael CA