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Isao Kato, Jun Iida, Hiroya Iwatake, Sadamu Minami, Noriko Kihara, Isamu Takeyama. "Two Patients with Tracheal Stenosis Following Prolonged Intubation of Cuffed Tubes." Practica oto-rhino-laryngologica Suppl 1991.Supplement48 (1991) 57-61