WORLD CHINESE JOURNAL OF DIGESTOLOGY, Volume 17, Issue 5,2009, Pages 524-528, doi:10.3969/j.issn.1009-3079.2009.05.020
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WORLD CHINESE JOURNAL OF DIGESTOLOGY, Volume 17, Issue 5,2009, Pages 500-503, doi:10.3969/j.issn.1009-3079.2009.05.014
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