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Gao, L; Zhang, L; Jin, Q (September 2009). “Meta-analysis: prevalence of HIV infection and syphilis among MSM in China”. Sexually transmitted infections85 (5): 354-8. doi:10.1136/sti.2008.034702. PMID19351623.
Karp, G; Schlaeffer, F; Jotkowitz, A; Riesenberg, K (January 2009). “Syphilis and HIV co-infection”. European journal of internal medicine20 (1): 9-13. doi:10.1016/j.ejim.2008.04.002. PMID19237085.
Eccleston, K; Collins, L; Higgins, SP (March 2008). “Primary syphilis”. International journal of STD & AIDS19 (3): 145-51. doi:10.1258/ijsa.2007.007258. PMID18397550.
Kent ME, Romanelli F (February 2008). “Reexamining syphilis: an update on epidemiology, clinical manifestations, and management”. Annals of Pharmacotherapy42 (2): 226-36. doi:10.1345/aph.1K086. PMID18212261.