1. Population Health Management, Mass General Brigham, Somerville, Massachusetts, USA.
2. Department of Emergency Medicine, Brigham and Women's Hospital, Boston, Massachusetts, USA.
3. Harvard Medical School, Boston, Massachusetts, USA.
4. Department of Emergency Medicine, Massachusetts General Hospital, Boston, Massachusetts, USA.
5. Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts, USA.
6. Performance Analysis and Improvement, Massachusetts General Hospital/Massachusetts General Physicians Organization, Boston, Massachusetts, USA.