4Petry F. Epidemiological study of Cryptosporidium parvum in sera of persons from Germany[J]. Infection, 1998,26(1):7-14
5David C S, Alfred D, Rene G S, et al. Cancer risk among women sterilized with transcervical quinacrine in Chile: an update through 1996[J]. Fertil Steril,2000,74(1):169-171
6Stephan A, Werner M, Dieter R, et al. Value of electronbeam computed tomography for the noninvasive detection of high-grade coronary-artery stenoses and occlusions [J]. N Engl J Med, 1998,339(27): 1964-1971
7Mehran A, Christopher A. Laparoecopic Nissen Fundoplication: two-year comprehensive follow-up of a technique of minimal peraesophaged dissection [J]. Ann Surg, 1998,2271):25-32