1. Department of Preventive and Biomedical Science, Faculty of Dentistry, University of Science and Technology, Sanaa, Yemen
2. Oral Microbiome Research Laboratory, Maurice H. Kornberg School of Dentistry, Temple University, Philadelphia, PA, USA
3. Department of Periodontology, Faculty of Dentistry, Thamar University, Thamar, Yemen
4. Department of Maxillofacial Surgery and Diagnostic Sciences, College of Dentistry, Jazan University, Jazan, Saudi Arabia
5. Madinat Khalifa Health Center, Primary Health Care Corporation, Doha, Qatar
6. Department of Microbiology, Forsyth Institute, Cambridge, MA, USA