Abdelouahab Bellou1, Simon P Conroy, Colin A Graham. 1. aDepartment of Emergency Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USAbDepartment of Health Sciences, Centre for Medicine, College of Medicine, Biological Sciences and Psychology, University of Leicester, Leicester, UKcDepartment of Emergency Medicine, Chinese University of Hong Kong, Shatin, Hong Kong.