4Pabich WL, Fihn SD, Stamm WE, et al. Prevalence and determinants of vaginal flora alterations in postmenopausal women [J]. J Infect Dis, 2003,188(7) : 1054
5Gregor Reid. Probiotit agents to protect the urogenital tract against infection [J]. Clin Nutri,2001,73(2) :437