Department of Nephrology and Dialysis University Hospital of Brazzaville Brazzaville Congo;
Hemodialysis Unit of the Medical Center for Specialists of the 15 years old plateau of Brazzaville Brazzaville Congo;
Department of Nephrology and Dialysis University Hospital of Brazzaville Brazzaville Congo;
Departement of Nephrology Edith Lucie Bongo General Hospital of Oyo Oyo Congo;
Department of Nephrology and Dialysis University Hospital of Brazzaville Brazzaville Congo;
Department of Cardiology and Internal Medicine University Hospital of Brazzaville Brazzaville Congo;
Departement of Nephrology University Hospital Hassan II of Fez Fez Morocco;
Departement of Nephrology University Hospital Hassan II of Fez Fez Morocco;