1 Division of Trauma, Emergency Surgery, and Surgical Critical Care, Department of Surgery, Massachusetts General Hospital, 55 Fruit Street, Boston, MA, USA. pjansson@bwh.harvard.edu.
2 Division of Emergency Critical Care, Department of Emergency Medicine, Brigham and Women's Hospital, 75 Francis Street, Neville House, Boston, MA, USA. pjansson@bwh.harvard.edu.
3 Department of Surgery, Harvard Medical School, Boston, MA, USA. pjansson@bwh.harvard.edu.