1. Hypertension in Africa Research Team (HART), School for Physiology, Nutrition and Consumer Sciences; North-West University; Potchefstroom; South Africa
2. Department of Epidemiology and Public Health; University College of London; UK
3. Department of Neurology, Medical Faculty Carl Gustav Carus; Dresden University of Technology; Dresden; Germany
4. School for Psychosocial Behavioral Sciences; North-West University; Potchefstroom; South Africa
5. Statistical Consultation Service; North-West University; Potchefstroom; South Africa
6. The Renal Hypertension Unit, Nelson Mandela School of Medicine; University of KwaZulu-Natal; South Africa