DR Tomlinson (Presenting Author) – University Hospitals Plymouth NHS Trust, Plymouth, UK; K Biscombe – Department of Medical Statistics, Plymouth University Peninsula Schools of Medicine and Dentistry, Plymouth, UK; J True – Department of Medical Statistics, Plymouth University Peninsula Schools of Medicine and Dentistry, Plymouth, UK; J Hosking – Department of Medical Statistics, Plymouth University Peninsula Schools of Medicine and Dentistry, Plymouth, UK; AJ Streeter – Department of Medical Statistics, Plymouth University Peninsula Schools of Medicine and Dentistry, Plymouth, UK