CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 23, Issue z1,2002, Pages 7-10, doi:10.3760/j.issn:0254-6450.2002.z1.004
FUJIAN JOURNAL OF ANIMAL HUSBANDRY AND VETERINARY, Volume 24, Issue z1,2002, Pages 23-24, doi:10.3969/j.issn.1003-4331.2002.z1.016
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 23, Issue z1,2002, Pages 217, doi:10.3760/j.issn:0254-6450.2002.z1.118
SICHUAN ANIMAL & VETERINARY SCIENCES, Volume 29, Issue z1,2002, Pages 67-69, doi:10.3969/j.issn.1001-8964.2002.z1.039
SHANGHAI MEDICAL JOURNAL, Volume 25, Issue z1,2002, Pages 5-7, doi:10.3969/j.issn.0253-9934.2002.z1.003