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. Infection Control and Prevention Unit, Lady Davis Carmel Medical Center, Haifa, Israel
4. Department of Community Medicine and Epidemiology, Lady Davis Carmel Medical Center, Haifa, Israel