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Nakamura K, Ruiz-Juvera A, Kubo A, Hashimoto S.Nakamura K, et al.Int J Rad Appl Instrum B. 1992 Jan;19(1):21-5. doi: 10.1016/0883-2897(92)90180-7.Int J Rad Appl Instrum B. 1992.PMID: 1577610