[1] Rabin Med Ctr, Dept Otolaryngol Head & Neck Surg, IL-49100 Petah Tiqwa, Israel
[2] Rabin Med Ctr, Epidemiol Unit, IL-49100 Petah Tiqwa, Israel
[3] Tel Aviv Univ, Sackler Fac Med, Schneider Childrens Med Ctr Israel, Dept Otorhinolaryngol, IL-69978 Tel Aviv, Israel