Department of Gastro-Enterology;
General Hospital of Loandjili;
Pointe-Noire;
Congo;
Faculty of Health Sciences;
Department of Public Health;
Brazzaville;
Congo;
Department of Gastro-Enterology;
University Hospital of Brazzaville;
Brazzaville;
Congo;
WHO Library;
Brazzaville;
Congo;