1. Department of Otolaryngology–Head and Neck Surgery, Lady Davis Carmel Medical Center, Haifa, Israel
2. Ruth and Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
3. Department of Community Medicine and Epidemiology, Lady Davis Carmel Medical Center, Haifa, Israel
4. Infection Control and Prevention Unit, Lady Davis Carmel Medical Center, Haifa, Israel