CHINESE JOURNAL OF PRACTICAL NURSING, Volume 25, Issue 17,2009, Pages 6-9, doi:10.3760/cma.j.issn.1672-7088.2009.06.046
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CHINESE JOURNAL OF PRACTICAL NURSING, Volume 25, Issue 17,2009, Pages 12-15, doi:10.3760/cma.j.issn.1672-7088.2009.06.048