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Takahioro Asakage, Satoshi Ebihara, Takashi Yoshiz, Masao Asai, Ryuichi Hayashi, takao Shizuka, Mitsuru Ebihara. "Tumor-positive Cervical Lymph Nodes in Cases of Occult Primary Cancer." JOURNAL OF JAPAN SOCIETY FOR HEAD AND NECK SURGERY 6.1 (1996) 29-34