CHINESE JOURNAL OF HEALTH MANAGEMENT, Volume 3, Issue 4,2009, Pages 238-241, doi:10.3760/cma.j.issn.1674-0815.2009.04.017
CHINESE JOURNAL OF HEALTH MANAGEMENT, Volume 3, Issue 4,2009, Pages 194-197, doi:10.3760/cma.j.issn.1674-0815.2009.04.002
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