TY - JOUR T1 - Trial registration: must take place before or at the onset of enrolment. JO - Emerg Med J PY - 2014/03/01 AU - Goodacre S ED - DO - DOI: 10.1136/emermed-2014-203566 VL - 31 IS - 3 SP - 176 Y2 - 2024/12/22 ER -