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National Medical Journal of China, , Issue 44,2014, Pages 3467-3470, doi:10.3760/cma.j.issn.0376-2491.2014.44.004
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National Medical Journal of China, , Issue 44,2014, Pages 3463-3466, doi:10.3760/cma.j.issn.0376-2491.2014.44.003