Stroke is the second largest cause of death worldwide, responsible for over six million deaths each year. A common cause of stroke is carotid artery disease, which can be treated in one of two ways: carotid artery surgery; or having a stent fitted, with a view to improving blood flow to the brain.  Until recently, it has been unclear which of these procedures results in better overall patient outcomes. To answer this question, researchers at Oxford Population Health at the…