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Nakajima M, Tamada S, Yoshida K, Sugihara S, Okimoto N, Niki Y, Manabe T, Soejima R.Nakajima M, et al. Among authors: niki y.Nihon Kyobu Shikkan Gakkai Zasshi. 1994 Nov;32(11):1109-14.Nihon Kyobu Shikkan Gakkai Zasshi. 1994.PMID: 7815767Japanese.
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Miyashita N, Karino T, Nagatomo Y, Yoshida K, Nakajima M, Okimoto N, Niki Y, Soejima R.Miyashita N, et al. Among authors: niki y.Kansenshogaku Zasshi. 1995 Apr;69(4):450-4. doi: 10.11150/kansenshogakuzasshi1970.69.450.Kansenshogaku Zasshi. 1995.PMID: 7751755Japanese.
Niki Y, Hashiguchi K, Tamada S, Yoshida K, Sugimura S, Nakajima M, Moriya O, Okimoto N, Soejima R.Niki Y, et al.Kansenshogaku Zasshi. 1994 Jun;68(6):788-91. doi: 10.11150/kansenshogakuzasshi1970.68.788.Kansenshogaku Zasshi. 1994.PMID: 8051447Japanese.