1 Department of Medicine, Physiology and Pharmacology and Community Health Sciences, Libin Cardiovascular Institute of Alberta, University of Calgary, Calgary, Alberta, Canada.
2 Department of Preventive & Social Medicine, University of Otago, Dunedin, New Zealand.
3 Wolfson Institute of Population Health, Barts and The London School of Medicine & Dentistry, Queen Mary University of London, Charterhouse Square, London, UK.