1 Kinshasa School of Public Health, Faculty of Medicine, University of Kinshasa, Democratic Republic of Congo. Electronic address: jditekemena@hotmail.fr.
2 University of Sciences, Technique and Technology, Bamako, Mali. Electronic address: sdounbi@gmail.com.
3 University of Sciences, Technique and Technology, Bamako, Mali. Electronic address: ebrahimsh2@googlemail.com.