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CHINESE JOURNAL OF MODERN NURSING, Volume 15, Issue 36,2009, Pages 3849-3851, doi:10.3760/cma.j.issn.1674-2907.2009.36.004
CHINESE JOURNAL OF MODERN NURSING, Volume 15, Issue 36,2009, Pages 3936-3937, doi:10.3760/cma.j.issn.1674-2907.2009.36.045