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Toshio Yamashita, Yuji Tohyama, Tadashi Iwano, Chiyonori Ino, Mako Kato, Makiko Ohtani, Tadami Kumazawa. "Office Closure Method for Perforated Tympanic Membrane Using Collagen Sheet." Practica Oto-Rhino-Laryngologica 84.12 (1991) 1691-1697