1. Center for Systematic Reviews of Health Policy and Systems Research (SPARK), American University of Beirut, Riad El-Solh/Beirut, Lebanon
2. Department of Pediatrics and Adolescent Medicine, Faculty of Medicine, American University of Beirut, Riad El-Solh/Beirut, Lebanon
3. Department of Family Medicine, Faculty of Medicine, Université Saint Joseph, Mar Mikhaël, Lebanon
4. Department of Internal Medicine, Faculty of Medicine, Beirut Arab University, Riad El Solh, Lebanon
5. Department of Internal Medicine, Faculty of Medicine, Damascus University, Damascus, Syria
6. Department of Internal Medicine, American University of Beirut, Riad El-Solh/Beirut, Lebanon