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N. Tsunoda, S. Kurose, K. Sasaki, Y. Wakita, S. Marui, T. Akiyama, T. Ono, K. Kakoo, K. Shiba, T. Shidahara, S. Hashiguchi, Y. Kono. "Roentgenographic Studies on Lumbar Spinal Canal Stenosis." Orthopedics & Traumatology (1980) 377-380