1. Is it the H or the EMS in HEMS that has an impact on trauma patient mortality? A systematic review of the evidence. Issue 9 (2nd August 2010) Authors: Butler, Daniel P; Anwar, Imran; Willett, Keith Journal: Emergency medicine journal Issue: Volume 27:Issue 9(2010) Page Start: 692 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗