6Zammarchi L, Borchi B, Chiappini E,et al. Syphilis in preg-nancy in Tuscany, description of a case series from a globalhealth perspective[ J]. J Matem Fetal Neonatal Med,2012,25(12) ;2601 -2605.
7Hong FC,Liu JB,Feng TJ, et al. Congenital syphilis: an e-conomic evaluation of a prevention program in China[ J]. SexTransm Dis,2010,37( 1) :26 -31.
8Wolff T,Shelton E, Sessions C,et al. Screening for syphilisinfection in pregnant women : evidence for the U. S. Preven-tive Services Task Force reaffirmation recommendation state-ment[ J]. Ann Intern Med,2009,150( 10) :710 - 716.