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Application of the COOP/WONCA charts to aged patients with chronic obstructive pulmonary disease: a comparison between Japanese and Chinese populations

Midori Yamaguchi, Motoyuki Nakao, Hideto Obata, Hideki Ikeda, Tetsuro Kanda, Qiao Wang, Yoriko Hara, Hisamitsu Omori and Yoko Ishihara*

BMC Public Health 2013, 13:754  doi:10.1186/1471-2458-13-754

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