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Okamoto M, Takahashi H, Yao K, Furukawa K.Okamoto M, et al. Among authors: yao k.Nihon Jibiinkoka Gakkai Kaiho. 1988 Sep;91(9):1375-80. doi: 10.3950/jibiinkoka.91.1375.Nihon Jibiinkoka Gakkai Kaiho. 1988.PMID: 3199251Japanese.No abstract available.
Okamoto M, Takahashi H, Yao K, Inagi K, Nakayama M, Makoshi T.Okamoto M, et al. Among authors: yao k.Nihon Jibiinkoka Gakkai Kaiho. 1995 Apr;98(4):571-8. doi: 10.3950/jibiinkoka.98.571.Nihon Jibiinkoka Gakkai Kaiho. 1995.PMID: 7782965Clinical Trial.Japanese.
Nishiyama K, Takahashi H, Okamoto M, Yao K, Inagi K, Nakayama M, Makoshi T.Nishiyama K, et al. Among authors: yao k.Acta Otolaryngol Suppl. 1996;524:79-82. doi: 10.3109/00016489609124353.Acta Otolaryngol Suppl. 1996.PMID: 8790767