1 Department of Surgery - Otolaryngology, Head and Neck Surgery, The University of Adelaide, Australia; Department of Neurosurgery, Royal Adelaide Hospital, Adelaide, South Australia, Australia. Electronic address: [email protected].
2 Department of Neurosurgery, Royal Adelaide Hospital, Adelaide, South Australia, Australia.
3 Department of Surgery - Otolaryngology, Head and Neck Surgery, The University of Adelaide, Australia; Department of Otolaryngology, Queen Elizabeth Hospital, Adelaide, Australia.