TY - JOUR T1 - Article 4. An introduction to estimation--1. Starting from Z JO - Emergency Medicine Journal UR - https://doi.org/10.1136/emj.17.6.409 PY - 2000/11/01 AU - Driscoll P ED - DO - DOI: 10.1136/emj.17.6.409 PB - BMJ VL - 17 IS - 6 SP - 409 EP - 415 Y2 - 2025/11/28 ER -