Cardiology Department;
Imperial College Healthcare NHS Trust;
Hammersmith Hospital;
Arthritis Research UK Epidemiology Unit;
University of Manchester;
National Heart and Lung Institute;
ImperiaCollege London;
Department of Cardiology;
Royal Brompton and Harefield;
NHS Foundation Trust Harefield Hospital;
Sudden death; Rheumatoid arthritis; Cardiovascular; QT; Autonomic nervous system; Arrhythmia;