1[1]Institute of Medicine, The hidden epidemic. First edition, Washington DC, National Academy Press, 1997:1～54
2[2]Fathalla M, Diczfalusy E, Spieler J. Contraception 21 - The Promise of Public/Private Sector Collaboration. Intern. J. Gynecol. Obstet,1999.67(Suppl. 2): 1～160
3[3]Ogra PL, Meslecky J, Lamm ME, et al, Mucosal Immunology, 2nd edition, San Diego, Academic Press, 1999. 1～1628
