Toshihiko Oba, M.D., Ph.D. E-mail:obat@1998.jukuin.keio.ac.jp
Medical Staff Imperial Gift Foundation, Tokyo Saiseikai Central Hospital 1-4, Mita Minato,Tokyo, 108-0073 Japan tel 81-3-3451-8211, fax 81-3-3451-6102
Department of Otolaryngology, School of medicine, Keio University 35 Shinanomachi, Shinjuku, Tokyo 160-8582 Japan tel 81-3-3353-1211
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