1. Durham Clinical Trials Unit
2. School of Medicine, Pharmacy and Health, Durham University, Queen's Campus, Wolfson Research Institute, University Boulevard; Stockton-on-Tees TS17 6BH UK
3. Department of Cardiology; Darlington Memorial Hospital, County Durham and Darlington NHS Foundation Trust; Hollyhurst Road Darlington UK
4. Department of Cardiology; The James Cook University Hospital, South Tees Acute Hospitals NHS Foundation Trust; Marton Road Middlesbrough UK