Chinese Journal of Preventive Medicine, Volume 45, Issue 9,2011, Pages 830-832, doi:10.3760/cma.j.issn.0253-9624.2011.09.014
Chinese Journal of Preventive Medicine, Volume 45, Issue 9,2011, Pages 833-835, doi:10.3760/cma.j.issn.0253-9624.2011.09.015
Chinese Journal of Preventive Medicine, Volume 45, Issue 9,2011, Pages 810-814, doi:10.3760/cma.j.issn.0253-9624.2011.09.010
Chinese Journal of Preventive Medicine, Volume 45, Issue 9,2011, Pages 849-851, doi:10.3760/cma.j.issn.0253-9624.2011.09.020
Chinese Journal of Preventive Medicine, Volume 45, Issue 9,2011, Pages 842-844, doi:10.3760/cma.j.issn.0253-9624.2011.09.018