INTERNATIONAL JOURNAL OF CEREBROVASCULAR DISEASES, Volume 17, Issue 7,2009, Pages 521-524, doi:10.3760/cma.j.issn.1673-4165.2009.07.007
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INTERNATIONAL JOURNAL OF CEREBROVASCULAR DISEASES, Volume 17, Issue 7,2009, Pages 500-505, doi:10.3760/cma.j.issn.1673-4165.2009.07.002