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HPMug2oMmNrOfxWQHLiEksa6s0hFu9Ox348d7QefarYlaFR5ArkhOwm3Da1pmxmxCtenj1+6luWD#r#n+EPn9L6Ce+9onqnMlT+i . 2011, (5): 49 -54 .  DOI: 10.3969/j.issn.1009-0479.2011.05.012