1. From the Department of Otolaryngology-Head and Neck Surgery, Rabin Medical Center (Drs Popovtzer, Bahar, Oestreicher-Kedem, Feinmesser, and Nageris), Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
2. From the ENT Unit, Schneider Children's Medical Center of Israel, Petah Tikva (Dr Raveh), Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.