Central Hospital of Huambo;
Huambo;
Angola;
Medical School;
University of Porto;
Porto;
Portugal;
Huambo Provincial Department of Health;
Huambo;
Angola;
Medical School;
UniversityJose Eduardo dos Santos;
Huambo;
Angola;
Municipal Hospital of Caála;
Medical School;
University José Eduardo dos Santos;
Huambo;
Angola;