1. Department of Global Health, Rollins School of Public Health, Emory University, 1518 Clifton Road NE, Atlanta, GA 30322, USA
2. Division of Cardiology, Emory University School of Medicine, 49 Jesse Hill Jr. Drive SE, Atlanta, GA 30303, USA
3. South African Medical Research Council and University of Cape Town, P.O. Box 19070, Tygerberg, Cape Town 7505, South Africa
4. Julius Centre for Primary Care, University Medical Centre, Utrecht, Postbus 85500, 3508 GA Utrecht, The Netherlands
5. The George Institute for Global Health, The University of Sydney, P.O. Box M201, Sydney, Australia