TY - JOUR T1 - Why is it so difficult to recruit patients to research in emergency care? Lessons from the AHEAD study JO - Emergency Medicine Journal PY - 2015/03/31 AU - Johnson R AU - Kuczawski M AU - Mason S ED - DO - DOI: 10.1136/emermed-2014-204401 PB - BMJ VL - 33 IS - 1 SP - 52 EP - 56 Y2 - 2024/09/20 ER -