CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 24, Issue 7,2003, Pages 637-638, doi:10.3760/j.issn:0254-6450.2003.07.041
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CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 24, Issue 7,2003, Pages 547-550, doi:10.3760/j.issn:0254-6450.2003.07.004
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