1 Department of Emergency Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA. Electronic address: jbaugh@partners.org.
2 Ideas42, USA. Electronic address: roran@ideas42.com.
3 Ideas42, USA. Electronic address: troberston@ideas42.com.
4 Ideas42, USA. Electronic address: mhankin@ideas42.com.
5 Ideas42, USA. Electronic address: kmoore@ideas42.com.
6 Department of Emergency Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA. Electronic address: bwhite@mgh.harvard.edu.