Division of Cardiology, University of Kinshasa Hospital, Kinshasa, Congo;
Division of nephrology, Department of Internal Medicine, University of Kinshasa Hospital, Kinshasa, Congo;
Centre medical cite des aveugles, University of Kinshasa Hospital, Kinshasa, Congo;
Clinique ngaliema, University of Kinshasa Hospital, Kinshasa, Congo;
Non-Dipping; Prevalence; Risk; Factors; Hypertension; Black; Africans;