Tiaoying, L, Jiamin, Q, Wen, Y, Craig, PS, Xingwang, C, Ning, X, Ito, A, Giraudoux, P, Wulamu, M, Wen, Y, Schantz, PM, "Echinococcosis in Tibetan populations, Western Sichuan Province, China", Emerging Infectious Diseases, 2005