TY - JOUR T1 - An epistemology of patient safety research: a framework for study design and interpretation. Part 2. Study design JO - Quality and Safety in Health Care PY - 2008/06/01 AU - Brown C AU - Hofer T AU - Johal A AU - Thomson R AU - Nicholl J AU - Franklin BD AU - Lilford RJ ED - DO - DOI: 10.1136/qshc.2007.023648 VL - 17 IS - 3 SP - 163 EP - 169 Y2 - 2025/04/09 ER -