1. Department of Community Medicine, Hamad Medical Corporation (HMC), Doha, Qatar
2. Community Medicine Department, Primary Health Care Corporation (PHCC), Doha, Qatar
3. Department of Public Health and Preventive Medicine, Cairo University, Cairo, Egypt
4. Biochemistry and Consultant Dermatologist, University of Hafr Al-Batin, Hafr Al-Batin, Saudi Arabia
5. Hamad Medical Corporation (HMC), Department of International Medical Affairs and Gastrointestinal Research Department, Doha, Qatar
6. Hamad Medical Corporation (HMC), Communicable Disease Center, Doha, Qatar
7. Department of Community Medicine Department, Sousse University, Sousse, Tunisia