CHINESE JOURNAL OF PREVENTIVE MEDICINE, Volume 43, Issue 6,2009, Pages 501-503, doi:10.3760/cma.j.issn.0253-9624.2009.06.012
CHINESE JOURNAL OF PREVENTIVE MEDICINE, Volume 43, Issue 6,2009, Pages 538-540, doi:10.3760/cma.j.issn.0253-9624.2009.06.022
CHINESE JOURNAL OF PREVENTIVE MEDICINE, Volume 43, Issue 6,2009, Pages 504-508, doi:10.3760/cma.j.issn.0253-9624.2009.06.013
CHINESE JOURNAL OF PREVENTIVE MEDICINE, Volume 43, Issue 6,2009, Pages 489-494, doi:10.3760/cma.j.issn.0253-9624.2009.06.010