1 Department of Community Health, Obafemi Awolowo University, Ile-Ife, Nigeria.
2 School of Pharmacy, University of the Western Cape Town, Cape Town 7530, South Africa.
3 College of Medicine, University of Lagos, Lagos, Nigeria.
4 Department of Public Health, Federal University of Sciences and Technology, Owerri, Nigeria.
5 School of Public Health, University of the Western Cape, Cape Town, South Africa.
6 Service of Oral and Maxilla-Facial Surgery, Department of Dental Medicine, Faculty of Medicine, University of Kinshasa, Kinshasa, Democratic Republic of the Congo.
7 National Center Laboratory of Oral Biomedicine Ministry of Research Innovation and Technology, Democratic Republic of the Congo, Kinshasa.
8 Department of Health Systems and population Health Sciences, Tilman J. Fertitta Family College of Medicine, University of Houston, Houston, TX, USA.