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1)	Marmot M, Smith GD: Why are the Japanese living longer? BMJ, 299: 1547-1551, 1989.
2)	�_�j�G�� N, �P�l�f�B BP, �J��` I�i�� Ė�j:��N�i��Ɛ��`, ��O�q��ɒ��ރ��[��Y�N�w, ��[, ��, 2008.
3)	McKinlay: A case for refocusing upstream (Day B, Watt et al: Essential Dental Public Health), p139, Oxford, 2002.
4)	Morita I, Nakagaki H, Yoshii S, et al: Is there a gradient by job classification in dental status in Japanese men?, Eur J Oral Sci, 115: 275-279, 2007.
5)	Morita I, Nakagaki H, Yoshii S, et al: Gradients in periodontal status in Japanese employed meles. J Clin Periodontol, 34: 952-956, 2007.
6)	��J��Y:21��I��N�ւ̓W�]�\|��ÁE��N�Â��, �v��C�}��w��X�P�A��l��D��a�J��t��h��, ��, 1980.

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