1. Labbe A-C, Mendonca AP, Alves AC, Jaffar S, Dias F, Alvarenga IC, et al. The impact of syphilis, HIV-1, and HIV-2 on pregnancy outcome in Bissau, Guinea-Bissau. Sex Transm Dis. 2002;29(3):157–67.
2. Organization WH: Sexually transmitted and other reproductive tract infections: a guide to essential practice. 2005 http://www.who.int/iris/handle/10665/43116.
3. Organization WH: Special Programme for Research and Training in Tropical Diseases (WHO/TDR/SDI/06.1). The Use of Rapid Syphilis Tests. TDR/SDI; 2006 http://www.who.int/reproductivehealth/publications/rtis/TDR_SDI_06_1/en/.
4. Genç M, Ledger WJ. Syphilis in pregnancy. Sex Transm Infect. 2000;76(2):73–9.
5. Organization WH: The global elimination of congenital syphilis: rationale and strategy for action 2007 http://www.who.int/reproductivehealth/publications/rtis/9789241595858/en/.