TY - JOUR T1 - Effects of London helicopter emergency medical service on survival after trauma. JO - BMJ PY - 1995/07/22 AU - Nicholl JP AU - Brazier JE AU - Snooks HA ED - DO - DOI: 10.1136/bmj.311.6999.217 VL - 311 IS - 6999 SP - 217 EP - 222 Y2 - 2025/04/13 ER -