Ilkka Kivekäs1, Juha-Pekka Vasama, Jari Hakomäki. 1. *Boston Children's Hospital, Department of Otolaryngology, Harvard Medical School, Boston, Massachusetts, U.S.A.; †Departments of Otorhinolaryngology, Tampere University Hospital, and ‡Department of Otorhinolaryngology, University of Tampere; and §Department of Radiology, Tampere University Hospital, Tampere, Finland.